15008716800domain: NAppears in sequencesE.g.f. 1/((1-x)(1-x-x^2)).at n=11A052646Number of endofunctions on [n] such that the LCM of their cycle lengths equals nine.at n=12A291115a(n) = Sum_{k = 0..n} E1(n, k)*k^2, where E1 are the Eulerian numbers A173018.at n=12A344054