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A131589 Expansion of (3+9*x+2*x^2)/((x+1)*(x^2+3*x+1)). 0
-3, 3, -2, -1, 9, -30, 85, -229, 606, -1593, 4177, -10942, 28653, -75021, 196414, -514225, 1346265, -3524574, 9227461, -24157813, 63245982, -165580137, 433494433, -1134903166, 2971215069, -7778742045, 20365011070, -53316291169, 139583862441, -365435296158, 956722026037 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..30.

FORMULA

a(n) + a(n+1) = (-1)^(n+1)*A001906(n) = (-1)^(n+1)*F(2n)

PROG

Floretion Algebra Multiplication Program, FAMP Code: 2tesforseq[A*B], with A = - .5'j + .5'k - .5j' + .5k' - 'ii' - .5'ij' - .5'ik' - .5'ji' - .5'ki' and B = + .5'ij' + .5'ji'; 1vesforseq(n) = (-1)^(n+1)*2, ForType: 1A

CROSSREFS

Cf. A001906.

Sequence in context: A175644 A102905 A020862 * A202691 A278402 A276415

Adjacent sequences:  A131586 A131587 A131588 * A131590 A131591 A131592

KEYWORD

easy,sign

AUTHOR

Creighton Dement, Aug 30 2007

STATUS

approved

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Last modified March 18 22:07 EDT 2019. Contains 321305 sequences. (Running on oeis4.)