197920145domain: NAppears in sequencesE.g.f. cos(sin(x)) (even powers only).at n=8A003709Number of partitions of n-set into odd blocks.at n=16A003724Expansion of e.g.f. sinh(sinh(x))*exp(x).at n=15A009598a(n) = n! * [x^n] exp(Sum_{k=1..n, gcd(n,k) = 1} x^k / k!).at n=16A335797