A161138 Main diagonal of the triangular array A161136.

1, 3, 9, 18, 80, 196, 554, 1824, 2292, 7218, 45522, 288135, 660113, 3201130, 10512530, 17675063, 191230544, 207521990

Offset

1,2

Links

Table of n, a(n) for n=1..18.

Formula

a(m) = A161136(m,m).

Crossrefs

Cf. A161135, A161136, A161137.

Sequence in context: A375903 A190905 A133136 * A201222 A349453 A067864

Adjacent sequences: A161135 A161136 A161137 * A161139 A161140 A161141

Keyword

more,nonn

Author

Max Alekseyev, Jun 02 2009

Status

approved