A099558 Antidiagonal sums of the triangle A099557.

1, 1, 2, 3, 4, 6, 9, 14, 22, 34, 52, 79, 120, 183, 280, 429, 657, 1005, 1536, 2347, 3587, 5484, 8386, 12824, 19609, 29981, 45837, 70079, 107145, 163820, 250476, 382969, 585541, 895258, 1368795, 2092808, 3199790, 4892313, 7480094, 11436670

Offset: 0

Author

Paul D. Hanna, Oct 22 2004

Keywords

• nonn

Crossrefs

Cf. A099557.

Programs

PARI

a(n)=polcoeff((1-x+x^2)/((1-x)^2-x^5)+x*O(x^n),n)

Formula

G.f.: (1-x+x^2)/((1-x)^2-x^5).