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Search: id:A049778
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| A049778 |
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a(n)=Sum{T(n,2k-1): k=1,2,...,[ (n+1)/2 ]}, array T as in A049777. |
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3
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| 1, 3, 9, 17, 32, 50, 78, 110, 155, 205, 271, 343, 434, 532, 652, 780, 933, 1095, 1285, 1485, 1716, 1958, 2234, 2522, 2847, 3185, 3563, 3955, 4390, 4840, 5336, 5848, 6409, 6987, 7617, 8265, 8968, 9690, 10470, 11270, 12131
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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G.f.: x^2(2x^2+x+1)/[(1-x)^4(1+x)^2]. Pairwise sums of A023855. - R. Stephan, May 06 2004
a(n) = Sum_{k=1..n} k*ceil(k/2). - Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 29 2006
Row sums of triangle A095800^2. - Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 12 2007
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CROSSREFS
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Cf. A095800.
Sequence in context: A035107 A090262 A006459 this_sequence A123325 A116688 A011755
Adjacent sequences: A049775 A049776 A049777 this_sequence A049779 A049780 A049781
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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