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A108629 G.f.: (1+x-sqrt(1-2*x-3*x^2-4*x^3))/(2+2*x+2*x^2). 1
1, 0, 1, 2, 4, 11, 28, 75, 207, 579, 1647, 4744, 13807, 40550, 120016, 357613, 1071916, 3229870, 9777767, 29724593, 90705886, 277744244, 853123473, 2627968236, 8116487286, 25128482223, 77971354506, 242439732171 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

CROSSREFS

Cf. A039983.

Sequence in context: A122423 A099016 A026122 * A007048 A148132 A032101

Adjacent sequences:  A108626 A108627 A108628 * A108630 A108631 A108632

KEYWORD

nonn

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Jun 12 2005

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Last modified February 17 13:28 EST 2012. Contains 206031 sequences.