A144271 Row sums of triangle A144270 (called S2hat(-1)).

1, 2, 5, 21, 129, 1099, 11647, 148292, 2190302, 36842892, 694276152, 14488348603, 331537914373, 8254117606799, 222087256536602, 6421589319659283, 198565371839434761, 6538245667687424041, 228396692050813678534, 8436237099236470594589

Offset: 1

Author

Wolfdieter Lang, Oct 09 2008

Keywords

• nonn
• easy

Crossrefs

Cf. A144270.

Formula

a(n) = Sum_{m=1..n} A144270(n,m), n>=1.