E.g.f. S(x) satisfies: C(x)^2 - S(x)^2 = 1 and D(x)^4 - S(x)^4 = 1, where functions C(x) and D(x) are described by A280626 and A280627, respectively.

A280625

E.g.f. S(x) satisfies: C(x)^2 - S(x)^2 = 1 and D(x)^4 - S(x)^4 = 1, where functions C(x) and D(x) are described by A280626 and A280627, respectively.

Terms

    a(0) =1a(1) =1a(2) =19a(3) =739a(4) =35641a(5) =3753721a(6) =500577499a(7) =91718242219

External references