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.
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.
Terms
- a(0) =1a(1) =4a(2) =28a(3) =548a(4) =35108a(5) =7507972a(6) =5383397764
External references
- oeis: A134048