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A126948 The sequence d[n] defined in A126940. 1
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 (list; graph; refs; listen; history; text; internal format)
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 A246988 A084362

Adjacent sequences:  A126945 A126946 A126947 * A126949 A126950 A126951

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mar 18 2007

STATUS

approved

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Last modified August 14 04:13 EDT 2020. Contains 336477 sequences. (Running on oeis4.)