A144883 Second column (m=2) of triangle A144881 (S1hat(3)).

1, 3, 21, 96, 684, 4320, 35640, 293760, 2881440, 29695680, 345643200, 4296499200, 58518028800, 851751936000, 13338801100800, 222145265664000, 3934764739584000, 73675580977152000, 1455693852146688000, 30238671742304256000, 659012259039805440000

Offset

0,2

Links

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

Formula

a(n) = A144881(n+2,2), n>=0.

Crossrefs

Cf. A144881, A001710 (first column), A144884 (third column).

Sequence in context: A069017 A367997 A264246 * A362567 A074597 A350726

Adjacent sequences: A144880 A144881 A144882 * A144884 A144885 A144886

Keyword

nonn,easy

Author

Wolfdieter Lang, Oct 09 2008

Status

approved