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Search: id:A132727
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| A132727 |
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a(n) = 3*2^(n-1)*a(n-1) |
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+0
1
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| 1, 3, 18, 216, 5184, 248832, 23887872, 4586471424, 1761205026816, 1352605460594688, 2077601987473440768, 6382393305518410039296, 39213424469105111281434624, 481854559876363607426268659712
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Power sequence relate to the Pythagorean musical scale: v(n,m)=v[0]*2^n*3*m starting at m=1: a(n)=3*2^(n-1)*a(n-1).
Hankel transform of A089022 with interpolated zeros. - Paul Barry (pbarry(AT)wit.ie), Mar 17 2008
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FORMULA
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a(n)=3^n*2^comb(n,2). - Paul Barry (pbarry(AT)wit.ie), Mar 17 2008
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MATHEMATICA
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a[0] = 1; a[1] = 3; a[n_] := a[n] = 3*2^(n - 1)*a[n - 1]; Table[a[n], {n, 0, 20}]
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CROSSREFS
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Sequence in context: A002824 A135077 A024488 this_sequence A111841 A071605 A137223
Adjacent sequences: A132724 A132725 A132726 this_sequence A132728 A132729 A132730
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KEYWORD
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nonn
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Nov 17 2007
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