A091028 Alternating row sums of array A090440 (generalized Stirling2 array (4,3)).

1, -1, -299, 40751, 5067841, -7323445921, -999631061099, 8071239253153439, 3226932423143680609, -35637793578511857426241, -56681720635442893862661899, 428341845237867375193339807439, 2249822227541602344980346463546081

Offset: 1

Author

Wolfdieter Lang, Dec 23 2003

Keywords

• sign
• easy

Crossrefs

Cf. A070531 (row sums of A090440).

Formula

a(n)=-sum(((-1)^k)*A090440(n, k), k=3..3*n), n>=1.