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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.
0
1, 4, 28, 548, 35108, 7507972, 5383397764, 13122109416964, 110735166982705668, 3291956693540520243204, 349880644048154072353961988, 134569675810924626719483447943172
OFFSET
0,2
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
Sequence in context: A203220 A338816 A111817 * A091969 A101346 A120604
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Oct 25 2007
STATUS
approved