A156132 Q_n(4) (see A104035).

1, 4, 33, 404, 6597, 134644, 3297693, 94228004, 3077100777, 113046200164, 4614532495353, 207201136625204, 10149511013598957, 538592387976486484, 30779388439090380213, 1884616483302733144004, 123087714448128536653137, 8541524061361098605073604

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Formula

G.f.: 1/Q(0), where Q(k) = 1 - 4*x*(2*k+1) - 17*x^2*(k+1)^2/Q(k+1); (continued fraction). - Sergei N. Gladkovskii, Sep 28 2013

Crossrefs

Sequence in context: A295256 A269926 A331794 * A215364 A370930 A213641

Adjacent sequences: A156129 A156130 A156131 * A156133 A156134 A156135

Keyword

nonn

Author

N. J. A. Sloane, Nov 06 2009

Status

approved