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Search: id:A141609
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| A141609 |
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a(n)=(a(n - 1)*a(n - 2) + a(n - 1)^2)/a(n - 3). |
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+0
1
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| 1, 1, 1, 2, 6, 48, 1296, 290304, 1763596800, 2400297571123200, 19846204885558066176000000, 223334408639880528216369404299444224000000, 20780031060559302184531906881808103844643569442380668928000000000000
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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A sequence constructed to have the pattern of a Somos-type sequence, but dominated by the Somos-4 sequence A006720.
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MATHEMATICA
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Clear[a, f, t, n, m] a[0] = 1; a[1] = 1; a[2] = 1; a[n_] := a[n] = (a[n - 1]*a[n - 2] + a[n - 1]^2)/a[n - 3]; Table[a[n], {n, 0, 20}]
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CROSSREFS
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Cf. A006720, A006721, A006722.
Sequence in context: A003053 A113296 A063744 this_sequence A096313 A126023 A088679
Adjacent sequences: A141606 A141607 A141608 this_sequence A141610 A141611 A141612
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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), Aug 22 2008
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Aug 24 2008
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