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Search: id:A135687
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| 1, 1, -1, -3, 0, 12, 12, -36, -96, 120, 792, -48, -6384, -6000, 45072, 93072, -312576, -1243296, 2195040, 17114592, -9225888, -231715584, -102553152, 3141465024, 4679762304, -42442213056, -112638647616, 566436761280, 2368655123136, -6694333057344, -44592815027520
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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This sequence gives an alternating output.
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FORMULA
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a(n)=a(n-1)-A004001(n)*a(n-2)
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MATHEMATICA
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Clear[Conway, b, a] (*A004001*) Conway[1] = Conway[2] = 1; Conway[n_Integer?Positive] :=Conway[n] =Conway[Conway[n - 1]] + Conway[n - Conway[n - 1]]; a[1] = 1; a[2] = 1; a[n_] := a[n] = a[n - 1] - Conway[n]*a[n - 2]; Table[a[n], {n, 1, 50}]
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CROSSREFS
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Cf. A004001.
Sequence in context: A055314 A110890 A071534 this_sequence A057374 A058896 A008403
Adjacent sequences: A135684 A135685 A135686 this_sequence A135688 A135689 A135690
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KEYWORD
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uned,sign
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Feb 19 2008
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