G.f.: A(x) = cm4(x)^2 + sm4(x)^2 where cm4(x) and sm4(x) are the g.f.s of A153300 and A153301, respectively, that satisfy cm4(x)^4 - sm4(x)^4 = 1.

A153302

G.f.: A(x) = cm4(x)^2 + sm4(x)^2 where cm4(x) and sm4(x) are the g.f.s of A153300 and A153301, respectively, that satisfy cm4(x)^4 - sm4(x)^4 = 1.

Terms

    a(0) =1a(1) =2a(2) =12a(3) =216a(4) =7056a(5) =368928a(6) =28340928a(7) =3000945024a(8) =419025809664

External references