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A126947 The sequence c[n] defined in A126940. 1
0, 2, 4, 12, 42, 132, 414, 1320, 4198, 13322, 42308, 134392, 426832, 1355612, 4305518, 13674594, 43431194, 137939776, 438104256, 1391442706, 4419296770, 14035924512, 44578852058, 141584833642, 449681053086, 1428211232054, 4536075755738, 14406820782444 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..27.

FORMULA

Empirical g.f.: -2*x*(x^2+1) / (x^6+4*x^5+4*x^4+7*x^3+x^2+2*x-1). - Colin Barker, Apr 08 2013

CROSSREFS

Sequence in context: A090959 A244035 A126942 * A188494 A202668 A200222

Adjacent sequences:  A126944 A126945 A126946 * A126948 A126949 A126950

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mar 18 2007

STATUS

approved

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Last modified September 26 04:44 EDT 2020. Contains 337346 sequences. (Running on oeis4.)