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Search: id:A047928
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| 0, 12, 72, 240, 600, 1260, 2352, 4032, 6480, 9900, 14520, 20592, 28392, 38220, 50400, 65280, 83232, 104652, 129960, 159600, 194040, 233772, 279312, 331200, 390000, 456300, 530712, 613872, 706440, 809100, 922560, 1047552, 1184832
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OFFSET
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2,2
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FORMULA
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a(n) = A002378(n)*A002378(n+1). - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 11 2006
a(n) = 12*A002415(n+1) = 2*A083374(n) = 4*A006011(n+1) = 6*A008911(n+1). - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 09 2007
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MAPLE
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a:=n->sum(sum(n^2, j=2..n), k=0..n): seq(a(n), n=0..33); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 09 2007
a:=n->(sum((numbperm(n, 3)), j=2..n)):seq(a(n), n=2..34); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 12 2008
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CROSSREFS
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Cf. A002378.
Cf. A002415, A006011, A008911, A083374.
Sequence in context: A060930 A101523 A143698 this_sequence A008533 A010024 A008414
Adjacent sequences: A047925 A047926 A047927 this_sequence A047929 A047930 A047931
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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