A126948 The sequence d[n] defined in A126940.

0, 0, 4, 12, 34, 110, 354, 1120, 3552, 11290, 35862, 113884, 361702, 1148810, 3648670, 11588338, 36805222, 116895404, 371266018, 1179160836, 3745078428, 11894570660, 37777796510, 119984315496, 381076645196, 1210319938646, 3844041278068, 12208882029838

Offset

0,3

Links

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

Formula

Empirical g.f.: -2*x^2*(x^3+3*x^2+2*x+2) / (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: A077994 A077843 A061703 * A131593 A340492 A084362

Adjacent sequences: A126945 A126946 A126947 * A126949 A126950 A126951

Keyword

nonn

Author

N. J. A. Sloane, Mar 18 2007

Status

approved