A132847 Column 1 of triangle A132845.

1, 2, 9, 42, 270, 1785, 13657, 108606, 943677, 8534290, 82099523, 819569205, 8575756709, 92782439316, 1042810799150, 12077608219410, 144446181373140, 1774918640030754, 22425992057948620, 290381947113460848

Offset

0,2

Links

Table of n, a(n) for n=0..19.

Formula

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

Prog

(PARI)

Crossrefs

Cf. triangles: A132845, A132844; other columns: A132846, A132848, A132849.

Sequence in context: A351881 A222472 A351882 * A275620 A121365 A018960

Adjacent sequences: A132844 A132845 A132846 * A132848 A132849 A132850

Keyword

nonn

Author

Paul D. Hanna, Sep 17 2007

Status

approved