A144893 Second column (m=2) of triangle A144891 (S1hat(5)).

1, 5, 55, 360, 3630, 29820, 321300, 3225600, 38808000, 466300800, 6360379200, 89703936000, 1389213504000, 22565765376000, 394272204480000, 7248941973504000, 141496402037760000, 2901258659819520000, 62617333274496000000, 1414755114367795200000, 33446554797269053440000

Offset

0,2

Links

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

Formula

a(n) = A144891(n+2,2), n>=0.

Crossrefs

Cf. A144891, A001720 (first column), A144894 (third column).

Sequence in context: A060558 A348065 A014852 * A015266 A138163 A335355

Adjacent sequences: A144890 A144891 A144892 * A144894 A144895 A144896

Keyword

nonn,easy

Author

Wolfdieter Lang, Oct 09 2008

Status

approved