| 0, 7, 21, 42, 70, 105, 147, 196, 252, 315, 385, 462, 546, 637, 735, 840, 952, 1071, 1197, 1330, 1470, 1617, 1771, 1932, 2100, 2275, 2457, 2646, 2842, 3045, 3255, 3472, 3696, 3927, 4165, 4410, 4662, 4921, 5187, 5460, 5740, 6027, 6321, 6622
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n) = 7/2*n*(n+1). G.f.: A(x) = 7*x/(1-x)^3.
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MAPLE
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[seq(7*binomial(n, 2), n=1..44)]; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 24 2006
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CROSSREFS
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Cf. A028896, A033996.
Cf. A028895, A046092, A045943, A002378, A028896.
Sequence in context: A045524 A125228 A024837 this_sequence A022602 A054569 A077354
Adjacent sequences: A024963 A024964 A024965 this_sequence A024967 A024968 A024969
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KEYWORD
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nonn,easy
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AUTHOR
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Joe Keane (jgk(AT)jgk.org)
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