A156131 Q_n(3) (see A104035).

1, 3, 19, 177, 2201, 34203, 637819, 13876377, 345022001, 9650948403, 299951259619, 10254726248577, 382459993625801, 15452902408998603, 672386203441625419, 31346622138810396777, 1558803698602736533601, 82360892667114765064803, 4607594447779876771255219

Offset: 0

Author

N. J. A. Sloane, Nov 06 2009

Keywords

• nonn

Formula

G.f.: 1/Q(0), where Q(k) = 1 - 3*x*(2*k+1) - 10*x^2*(k+1)^2/Q(k+1); (continued fraction). - Sergei N. Gladkovskii, Sep 28 2013