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A049779
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a(n)=Sum{T(n,2k): k=1,2,...,[ n/2 ]}, array T as in A049777.
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0
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2, 5, 13, 23, 41, 62, 94, 130, 180, 235, 307, 385, 483, 588, 716, 852, 1014, 1185, 1385, 1595, 1837, 2090, 2378, 2678, 3016, 3367, 3759, 4165, 4615, 5080, 5592, 6120, 6698, 7293, 7941, 8607, 9329, 10070, 10870, 11690, 12572
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,1
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FORMULA
| G.f.: x^2(x^2+x+2)/[(1-x)^4(1+x)^2]. Pairwise sums of A023856. - R. Stephan, May 06 2004
a(n) = Sum_{k=1..n} k*floor(k/2). - Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 29 2006
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CROSSREFS
| Sequence in context: A046696 A102719 A075470 * A106009 A194552 A079780
Adjacent sequences: A049776 A049777 A049778 * A049780 A049781 A049782
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KEYWORD
| nonn
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
| More terms from R. Stephan, May 06 2004
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