68497228800domain: NAppears in sequencesLah numbers: a(n) = n!*binomial(n-1,2)/6.at n=12A001754Largest number in n-th row of triangle of Lah numbers (A008297 and A271703).at n=13A002868E.g.f. x^3/(1-x)^2.at n=13A052571