A134048 a(n) = [x^n] G(x)^( 2^(n+2) ) / 4^n, where G(x) is the g.f. of A134046 such that G(x) satisfies: [x^n] G(x)^(2^n) = 4^n for n>=0.

1, 4, 28, 548, 35108, 7507972, 5383397764, 13122109416964, 110735166982705668, 3291956693540520243204, 349880644048154072353961988, 134569675810924626719483447943172

Offset

0,2

Links

Table of n, a(n) for n=0..11.

Prog

(PARI) {a(n)=local(A=[]); for(i=0, n, A=concat(A, 0); A[i+1]=(4^i - Vec(Ser(A)^(2^i))[i+1])/2^i); Vec(Ser(A)^(2^(n+2)))[n+1]/4^n}

Crossrefs

Cf. A134046, A134047.

Sequence in context: A203220 A338816 A111817 * A091969 A101346 A120604

Adjacent sequences: A134045 A134046 A134047 * A134049 A134050 A134051

Keyword

nonn

Author

Paul D. Hanna, Oct 25 2007

Status

approved