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Search: id:A064108
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| 1, 21, 421, 8421, 168421, 3368421, 67368421, 1347368421, 26947368421, 538947368421, 10778947368421, 215578947368421, 4311578947368421, 86231578947368421, 1724631578947368421, 34492631578947368421
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,100
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FORMULA
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a(n)=20*a(n-1)+1 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 29 2009]
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EXAMPLE
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For n=2, a(2)=20*1+1=21; n=3, a(3)=20*21+1=421: n=4, a(4)=20*421+1=8421 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 29 2009]
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MAPLE
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a:=n->sum(20^(n-j), j=0..n): seq(a(n), n=0..15); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 11 2007
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PROGRAM
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(PARI) for(n=1, 23, print((20^n-1)/19))
(Other) sage: [gaussian_binomial(n, 1, 20) for n in xrange(1, 17)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 29 2009]
(PARI) { for (n=1, 100, write("b064108.txt", n, " ", (20^n - 1)/19) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 07 2009]
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CROSSREFS
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Sequence in context: A106656 A083043 A097833 this_sequence A067895 A092499 A167255
Adjacent sequences: A064105 A064106 A064107 this_sequence A064109 A064110 A064111
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KEYWORD
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easy,nonn,new
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Sep 17 2001
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