A027305 a(n) = Sum_{k=0..floor((n+1)/2)} (k+1) * A008315(n, k).

1, 3, 5, 13, 24, 58, 111, 257, 500, 1126, 2210, 4882, 9632, 20980, 41531, 89497, 177564, 379438, 754014, 1600406, 3184016, 6720748, 13382710, 28117498, 56026984, 117254268, 233765636, 487589572, 972504704, 2022568168

Offset

0,2

Links

Table of n, a(n) for n=0..29.

Formula

a(2n) = A065982(n+1)/2 = (n+2)*binomial(2n+2, n+1)/2 - 4^n.

Crossrefs

Cf. A065982.

Sequence in context: A026733 A005824 A336103 * A026766 A026709 A219699

Adjacent sequences: A027302 A027303 A027304 * A027306 A027307 A027308

Keyword

nonn

Author

Clark Kimberling

Status

approved