A167751 Diagonal sums of A167749.

1, 0, 1, 1, 2, 4, 7, 14, 27, 52, 102, 198, 387, 755, 1474, 2879, 5622, 10982, 21450, 41900, 81847, 159880, 312315, 610086, 1191768, 2328054, 4547732, 8883767, 17354001, 33900200, 66222412, 129362318, 252703135, 493643580, 964309346

Offset

0,5

Comments

Hankel transform is A167753.

Links

Table of n, a(n) for n=0..34.

Formula

G.f.: 1/(1-x^2/(1-x/(1-x^2/(1-x^3/(1-x^4/(1-...)))))) (continued fraction);

G.f.: 1/(1-x^2*f(x)), f(x) the g.f. of A005169.

Example

G.f. = 1 + x^2 + x^3 + 2*x^4 + 4*x^5 + 7*x^6 + 14*x^7 + 27*x^8 + 52*x^9 + ...

Crossrefs

Sequence in context: A001631 A108758 A018085 * A190822 A107949 A155099

Adjacent sequences: A167748 A167749 A167750 * A167752 A167753 A167754

Keyword

easy,nonn

Author

Paul Barry, Nov 10 2009

Status

approved