1159200domain: NAppears in sequencesFibonacci sequence beginning 0, 25.at n=24A022359a(n) = (n+1)*F(n), F(n) = Fibonacci numbers A000045.at n=24A099920Numbers n such that there exists a pair x,y, where x<y, x! = n and y! = n, that makes {x,y,n,n} an amicable multiset.at n=3A273969