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Search: id:A103457
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| 1, 4, 10, 28, 82, 244, 730, 2188, 6562, 19684, 59050, 177148, 531442, 1594324, 4782970, 14348908, 43046722, 129140164, 387420490, 1162261468, 3486784402, 10460353204, 31381059610, 94143178828, 282429536482, 847288609444
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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P. De Geest, World!Of Numbers
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FORMULA
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G.f.: (1-3x^2)/((1-x)(1-3x)); a(n)=sum{k=0..n, binomial(n, k)*0^(k(n-k))*3^k}.
a(n)=A034472(n), n>0. a(n)=A094388(n-1), n>1. a(n+1)-a(n)=A110593(n+1). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 04 2008]
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CROSSREFS
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Cf. A034772, A046231.
Sequence in context: A026150 A026123 A091468 this_sequence A083587 A061639 A008995
Adjacent sequences: A103454 A103455 A103456 this_sequence A103458 A103459 A103460
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Feb 07 2005
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