OFFSET
0,2
COMMENTS
Equals the binomial transform of A125276.
FORMULA
G.f. A(x) satisfies: A( x*(1-x)/(1+x-x^2) )/(1+x-x^2) = 1 + x*A(x).
PROG
(PARI) {a(n)=local(A=[1]); if(n==0, 1, for(i=1, n, A=Vec(Ser(concat(concat(A[ #A], A), A[ #A]))/(1-x))); A[n+1])}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Aug 18 2007
STATUS
approved