91718242219
domain: N
Appears in sequences
- 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.at n=7A280625
- E.g.f. C(x) + S(x), such that: C(x)^2 - S(x)^2 = 1 and D(x)^4 - S(x)^4 = 1, where functions S(x), C(x), and D(x) are described by A280625, A280626, and A280627, respectively.at n=15A280628