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Search: id:A086444
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| A086444 |
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Sequence associated with palindromic structures. |
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+0
2
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| 1, 3, 10, 37, 150, 653, 2990, 14157, 68470, 335533, 1657470, 8227277, 40957190, 204250413, 1019649550, 5093448397, 25452860310, 127221189293, 635976675230, 3179495693517, 15896315681830, 79478090576173, 397379990430510
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Binomial transform of A007581. Second binomial transform of A007051 (with extra leading 1).
Hankel transform is := [1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...]. [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 04 2008]
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FORMULA
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G.f.: (1-7x+11x^2)/((1-2x)(1-3x)(1-5x)); a(n)=2^n/3+3^n/2+5^n/6.
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CROSSREFS
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Sequence in context: A063029 A151058 A044048 this_sequence A064613 A138378 A005493
Adjacent sequences: A086441 A086442 A086443 this_sequence A086445 A086446 A086447
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jul 20 2003
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