A145359 Second column (m=2) of triangle A145357 (S1hat(6)).

1, 6, 78, 588, 6804, 62496, 753984, 8273664, 109118016, 1408700160, 20697223680, 309818234880, 5100265336320, 87215844925440, 1605019401216000, 30898776106598400, 631358784683827200, 13503510009903513600, 303781522335363072000, 7137966147222822912000

Offset: 1

Author

Wolfdieter Lang, Oct 17 2008

Keywords

• nonn
• easy

Crossrefs

Cf. A145357, A001725 (first column), A145360 (third column).

Formula

a(n) = A145357(n+2,2), n>=0.

Extensions

Changed offset from 0 to 1 by Wolfdieter Lang, Nov 17 2008