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A107443 G.f. (3*x^2+1)/((1-x)*(2*x^2+x+1)*(2*x^2-x+1)). 1
1, 1, 1, 1, -3, -3, 9, 9, -11, -11, 1, 1, 45, 45, -135, -135, 229, 229, -143, -143, -483, -483, 2025, 2025, -4139, -4139, 4321, 4321, 3597, 3597, -28071, -28071, 69829, 69829, -97199, -97199, 12285, 12285, 351945, 351945, -1104971, -1104971, 1907137, 1907137, -1301523, -1301523, -3723975, -3723975 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..47.

Index entries for linear recurrences with constant coefficients, signature (1,-3,3,-4,4).

FORMULA

a(2n) = a(2n+1) = A174565(n).

MAPLE

with(gfun): seriestolist(series((3*x^2+1)/((1-x)*(2*x^2+x+1)*(2*x^2-x+1)), x=0, 50));

CROSSREFS

Sequence in context: A064235 A098355 A183429 * A204099 A062234 A168329

Adjacent sequences:  A107440 A107441 A107442 * A107444 A107445 A107446

KEYWORD

easy,sign

AUTHOR

Creighton Dement, May 26 2005

STATUS

approved

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Last modified October 25 01:40 EDT 2021. Contains 348233 sequences. (Running on oeis4.)