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Search: id:A134751
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| A134751 |
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Hankel transform of expansion of (1/(1-x^2))c(x/(1-x^2)), where c(x) is the g.f. of A000108. |
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4
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| 1, 2, 8, 32, 256, 4096, 65536, 2097152, 134217728, 8589934592, 1099511627776, 281474976710656, 72057594037927936, 36893488147419103232, 37778931862957161709568, 38685626227668133590597632
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Hankel transform of A105864.
The sequence 1,1,2,8,... with general term 2^floor(n^2/3) is the Hankel transform of A109033. [From Paul Barry (pbarry(AT)wit.ie), Dec 14 2008]
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FORMULA
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a(n)=2^floor((n+1)^2/3); a(n)=Product{k=1..n, (5/3-2*cos(2*pi*k/3)/3)^(n-k+1)}; a(n)=Product{k=1..n, A130196(k)^(n-k+1)};
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CROSSREFS
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Sequence in context: A081358 A048855 A062797 this_sequence A139014 A063505 A085466
Adjacent sequences: A134748 A134749 A134750 this_sequence A134752 A134753 A134754
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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), Nov 08 2007
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