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Search: id:A135713
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| 0, 5, 27, 78, 170, 315, 525, 812, 1188, 1665, 2255, 2970, 3822, 4823, 5985, 7320, 8840, 10557, 12483, 14630, 17010, 19635, 22517, 25668, 29100, 32825, 36855, 41202, 45878, 50895, 56265, 62000, 68112, 74613, 81515, 88830, 96570, 104747, 113373, 122460, 132020
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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M. E. Larsen, The eternal triangle - a history of a counting problem, College Math. J., 20 (1989), 370-392.
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FORMULA
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O.g.f.: x*(7*x+5)/(x-1)^4. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 22 2008.
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MAPLE
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a:=n->sum(j+sum(2+sum(2, j=1..n), j=1..n), j=1..n):seq(a(n), n=0..40); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Dec 06 2008]
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CROSSREFS
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Bisection of A002717.
Sequence in context: A137116 A137117 A064675 this_sequence A085740 A129868 A069993
Adjacent sequences: A135710 A135711 A135712 this_sequence A135714 A135715 A135716
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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), Mar 05 2008
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