A024591 a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = (F(2), F(3), ...).

1, 2, 7, 11, 27, 44, 96, 155, 315, 510, 994, 1608, 3043, 4924, 9123, 14761, 26909, 43540, 78370, 126805, 225911, 365532, 645732, 1044816, 1832677, 2965334, 5170111, 8365415

Offset

1,2

Links

Table of n, a(n) for n=1..28.

Formula

G.f.: x(-x^4+2x^2+x+1)/[(1+x^2)(1+x-x^2)(1-x-x^2)^2].

Crossrefs

Sequence in context: A023864 A024857 A024481 * A350711 A309465 A309466

Adjacent sequences: A024588 A024589 A024590 * A024592 A024593 A024594

Keyword

nonn

Author

Clark Kimberling

Status

approved