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Search: id:A137565
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| 1, 8, 3072, 141557760, 1461147874099200, 5429466527263925207040000, 10652562037579218110269404217344000000, 15215364593060190936848463156185060517032755200000000
(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)=Product{k=0..n-1, (8(k+1)(2k+1))^(n-k)}.
a(n)=8^C(n+1,2)*Product{k=1..n, k!*Product{i=1..k-1, 2i+1}}; a(n)=8^C(n+1,2)*A000178(n)*A057863(n).
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CROSSREFS
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Sequence in context: A046248 A078525 A125539 this_sequence A079177 A046250 A087925
Adjacent sequences: A137562 A137563 A137564 this_sequence A137566 A137567 A137568
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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 26 2008, Apr 25 2008
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EXTENSIONS
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Edited by njas, May 14 2008 at the suggestion of R. J. Mathar.
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