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A135687 a(n) = a(n-1) - A004001(n)*a(n-2), a(1) = 1, a(2) = 1. 1
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; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..500

FORMULA

a(n) = a(n-1) - A004001(n)*a(n-2).

MATHEMATICA

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}]

CROSSREFS

Cf. A004001.

Sequence in context: A249010 A071534 A269880 * A057374 A269035 A268904

Adjacent sequences:  A135684 A135685 A135686 * A135688 A135689 A135690

KEYWORD

sign,less

AUTHOR

Roger L. Bagula, Feb 19 2008

STATUS

approved

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Last modified July 6 23:01 EDT 2020. Contains 335484 sequences. (Running on oeis4.)