0,3

Hankel transform is A154604.

G.f: 1/(1-x-x^2/(1-x-3x^2/(1-x-6x^2/(1-x-10x^2/(1-x-15x^2..... (continued fraction);

E.g.f.: exp(x)*(sec(x/sqrt(2))^2;

Sequence in context: A115625 A056323 A081557 this_sequence A063254 A123443 A123427

Adjacent sequences: A154600 A154601 A154602 this_sequence A154604 A154605 A154606

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Jan 12 2009