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

Author

N. J. A. Sloane, Nov 06 2009

Keywords

• nonn

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