A132846 Column 0 of triangle A132845.

1, 1, 3, 13, 73, 466, 3309, 25425, 209717, 1837168, 16995545, 164906160, 1671977735, 17635855420, 193014602116, 2185071349740, 25536219128057, 307379906553394, 3804874686396912, 48350298542927709, 629940434070025851

Offset

0,3

Links

Table of n, a(n) for n=0..20.

Formula

a(n) = A132844(2n,0) = A132844(2n+1,0).

Prog

(PARI)

Crossrefs

Cf. triangles: A132845, A132844; other columns: A132847, A132848, A132849.

Sequence in context: A063512 A199317 A205776 * A293196 A193931 A367757

Adjacent sequences: A132843 A132844 A132845 * A132847 A132848 A132849

Keyword

nonn

Author

Paul D. Hanna, Sep 17 2007

Status

approved