A126947 The sequence c[n] defined in A126940.

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

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: A244035 A340025 A126942 * A188494 A202668 A200222

Adjacent sequences: A126944 A126945 A126946 * A126948 A126949 A126950

Keyword

nonn

Author

N. J. A. Sloane, Mar 18 2007

Status

approved