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Search: id:A122591
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| A122591 |
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a(n) = 2*a(n - 1) - a(n - 2) - (a(n - 1)^2 + a(n - 2)^2). |
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+0
1
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| 1, 1, 3, 15, 261, 68853, 4740941175, 22476523239032929731, 505194096914787342916581691483319031273, 255221075557547546310804864838512137564534415781651685947633570258183940865705
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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S. M. Ulam, Problems in Modern Mathematics, John Wiley and Sons, New York, 1960, page 110
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MATHEMATICA
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a[0] = 1; a[1] = 1; a[n_] := a[n] = 2*a[n - 1] - a[n - 2] +(a[n - 1]^2 + a[n - 2]^2); Table[a[n], {n, 0, 10}]
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CROSSREFS
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Sequence in context: A116518 A050474 A051179 this_sequence A120607 A013352 A013354
Adjacent sequences: A122588 A122589 A122590 this_sequence A122592 A122593 A122594
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KEYWORD
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nonn
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AUTHOR
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Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 19 2006
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Sep 21 2006
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