2634508800domain: NAppears in sequencesLah numbers: a(n) = (n-1)*n!/2.at n=10A001286a(n) = (n+2)! * Sum_{k = 1..n} 1/((k+1)*(k+2)).at n=11A180119Sum of the sizes of the normalizers of all prime order cyclic subgroups of the alternating group A_n.at n=11A181967