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Search: id:A097813
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| 1, 2, 6, 16, 38, 84, 178, 368, 750, 1516, 3050, 6120, 12262, 24548, 49122, 98272, 196574, 393180, 786394, 1572824, 3145686, 6291412, 12582866, 25165776, 50331598, 100663244, 201326538, 402653128, 805306310, 1610612676, 3221225410, 6442450880, 12884901822, 25769803708
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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G.f. : (1-2x+3x^2)/((1-x)^2(1-2x)); a(n)=2a(n-1)+2n-2, n>0, a(0)=1; a(n)=4a(n-1)-5a(n-2)+2a(n-3).
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MATHEMATICA
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s=2; lst={1, s}; Do[s+=(s+=n); AppendTo[lst, s], {n, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 11 2008]
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CROSSREFS
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Cf. A079583.
Sequence in context: A128232 A099099 A074082 this_sequence A093041 A156616 A046209
Adjacent sequences: A097810 A097811 A097812 this_sequence A097814 A097815 A097816
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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), Aug 25 2004
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