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

Author

Wolfdieter Lang, Oct 09 2008

Keywords

• nonn
• easy

Crossrefs

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

Formula

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