A144276 Row sums of triangle A144275 (called S2hat(-2)).

1, 3, 13, 97, 997, 13585, 225625, 4454801, 101415881, 2618639033, 75524367593, 2406745316697, 83950853842617, 3181371937414425, 130135485102246265, 5714800778645325881, 268144898273200109561, 13387708871579930596793, 708640690235801235876153

Offset: 1

Author

Wolfdieter Lang, Oct 09 2008

Keywords

• nonn
• easy

Crossrefs

Cf. A144275.

Formula

a(n) = Sum_{m=1..n} A144275(n,m), n>=1.