4302305280domain: NAppears in sequencesTriangle read by rows, the inverse Bell transform of n!*binomial(4,n) (without column 0).at n=37A011801Second column (m=2) of triangle S2p(-4) = A011801.at n=7A144347Numbers m = concat(s,t) such that m = sigma(s) * sigma(t), where sigma(x) is the sum of the divisors of x.at n=21A253824