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Search: id:A136807
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| A136807 |
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Hankel transform of double factorial numbers n!*2^n=A000165(n). |
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2
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| 1, 4, 256, 589824, 86973087744, 1282470362637926400, 2723154477021188283432960000, 1133321924829207204666583887642624000000, 120746421332702772771144114237731253721340313600000000
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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By the properties of the Hankel transform, a(n)=2^(n(n+1))*A055209(n).
Also Hankel transform of A000354, A010844, A082032 . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jan 23 2008
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REFERENCES
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Michael Z. Spivey and Laura L. Steil, The k-Binomial Transforms and the Hankel transform, Journal of Integer Sequences, Vol. 9(2006), Article 06.1.1.
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FORMULA
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a(n)=product{k=1..n, (2k)^(2(n-k+1))};
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CROSSREFS
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Adjacent sequences: A136804 A136805 A136806 this_sequence A136808 A136809 A136810
Sequence in context: A071617 A122249 A060757 this_sequence A057156 A132656 A137840
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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), Jan 23 2008
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