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A126946 The sequence b[n] defined in A126940. 1
0, 2, 4, 12, 40, 128, 404, 1282, 4076, 12946, 41110, 130570, 414708, 1317126, 4183250, 13286248, 42197850, 134022604, 425663006, 1351928684, 4293798244, 13637334278, 43312907878, 137564127106, 436911072754, 1387653086532, 4407260902428, 13997697874880 (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^3-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: A170809 A170808 A099214 * A113179 A214761 A327845

Adjacent sequences:  A126943 A126944 A126945 * A126947 A126948 A126949

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mar 18 2007

STATUS

approved

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Last modified September 28 22:26 EDT 2020. Contains 337420 sequences. (Running on oeis4.)