E.g.f. E(x) = C(x) + S(x) such that C(x)^2 - S(x)^2 = 1 and C'(x)^2 + S'(x)^2 = 1, where C(x) is the e.g.f. of A290880 and S(x) is the e.g.f. of A290881.

A290882

E.g.f. E(x) = C(x) + S(x) such that C(x)^2 - S(x)^2 = 1 and C'(x)^2 + S'(x)^2 = 1, where C(x) is the e.g.f. of A290880 and S(x) is the e.g.f. of A290881.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =-1a(4) =-7a(5) =25a(6) =265a(7) =-1705a(8) =-24175a(9) =227665a(10) =4037425a(11) =-50333425a(12) =-1070526775a(13) =16655398825a(14) =412826556025

External references