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Search: id:A143392
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| A143392 |
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A quadratic recursion sequence: a(n)=a(n - 1)^2 - 2*a(n - 1) - a(n - 2)^2 + 2*a(n - 2). |
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+0
1
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| 1, 2, 1, -1, 4, 5, 7, 20, 325, 104615, 10943984020, 119770786197183303365, 14345041226291394498726932547331126324135, 205780207783999715270619814569860727079365052973702253248437750317796955577133
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n)=a(n - 1)^2 - 2*a(n - 1) - a(n - 2)^2 + 2*a(n - 2).
log a(n) ~ 0.011287... * 2^n - Charles R Greathouse IV (charles.greathouse(AT)case.edu), Oct 06 2009
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MATHEMATICA
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Clear[a, n]; a[0] = 1; a[1] = 2; a[n_] := a[n] = a[n - 1]^2 - 2*a[n - 1] - a[n - 2]^2 + 2*a[n - 2]; Table[a[n], {n, 0, 15}]
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CROSSREFS
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Sequence in context: A102610 A134172 A078047 this_sequence A090668 A156579 A034870
Adjacent sequences: A143389 A143390 A143391 this_sequence A143393 A143394 A143395
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KEYWORD
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sign
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AUTHOR
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Roger L. Bagula and Gary W. Adamson (rlbagulatftn(AT)yahoo.com), Oct 23 2008
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