334169853267domain: NAppears in sequencesExpansion of exp( Sum_{n >= 1} A000281(n)*x^n/n ).at n=7A255883Square array read by antidiagonals upwards: the n-th row o.g.f. is exp( Sum_{i >= 1} c(n,i)*x^i/i ) for n >= 1, where c(n,k) is Shanks' array of generalized Euler and class numbers.at n=43A262143