507177domain: NAppears in sequencesExponential generating function A(x) is the unique solution of the Cauchy problem: A'(x) = exp(x+A(x)^2-1), A(0) = 1.at n=7A209305Numbers k such that Sum_{d|k} sigma(d)^3/d is an integer, where d are the divisors of k.at n=26A226566