A131710 Overlay of Pell numbers: a(n)=A000129(n)+A000129(n-6).

0, 1, 2, 5, 12, 29, 70, 170, 410, 990, 2390, 5770, 13930, 33630, 81190, 196010, 473210, 1142430, 2758070, 6658570, 16075210, 38808990, 93693190, 226195370, 546083930, 1318363230, 3182810390, 7683984010, 18550778410, 44785540830, 108121860070

Offset: 0

Author

Paul Curtz, Sep 14 2007

Keywords

• nonn

Formula

a(n)=A000129(n), n <=6. a(n)=10*A001333(n-3), n >=7.

O.g.f.: x(1+x^2)(1-x^2+x^4)/(1-2x-x^2). - R. J. Mathar, Jul 07 2008.

Extensions

Edited by R. J. Mathar, Jul 07 2008