227665

Appears in sequences

• E.g.f. S(x) satisfies: 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.at n=4A290881
• 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.at n=9A290882
• Expansion of g.f. A(x) satisfying A(x) = exp(x*A(x) + L(x)), where L'(x) = is the least nonnegative integer series such that A(x) is an integer series with A'(0) = 1.at n=15A370718