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Search: id:A120581
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| A120581 |
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Hankel transform of sum{k=0..n, C(2k,k)*2^k}. |
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+0
1
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| 1, 4, -64, -28672, -17825792, -24696061952, -4398046511104, 6413125869375586304, 1279761316857673852911616, 565738597953418785628899770368, 372547299599873882347063111621541888, -5264848781000759906705331926184317767647232
(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)=4^(n+C(n,2))(-1)^n*sum{k=0..n, C(n+k,2k)(-2)^(n-k)}; a(n)=8^n*4^C(n,2)*sum{k=0..n, C(n+k,2k)(-2)^(-k)}; a(n)=4^n*4^C(n,2)(-1)^n*A087168(n);
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CROSSREFS
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Cf. A120580.
Sequence in context: A053763 A053923 A051191 this_sequence A146520 A030176 A033635
Adjacent sequences: A120578 A120579 A120580 this_sequence A120582 A120583 A120584
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KEYWORD
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easy,sign
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jun 15 2006
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