A144884 Third column (m=3) of triangle A144881 (S1hat(3)).

1, 3, 21, 123, 792, 5292, 42768, 348840, 3313440, 33734880, 382423680, 4683303360, 62795865600, 903908678400, 14018003596800, 231803919244800, 4081121327001600, 76062618390528000, 1497060883196928000, 31001124301830144000, 673857550403702784000

Offset: 0

Author

Wolfdieter Lang, Oct 09 2008

Keywords

• nonn
• easy

Crossrefs

Cf. A144881, A144883 (second column).

Formula

a(n) = A144881(n+3,3), n>=0.