513137616783domain: NAppears in sequencesa(n) = n*a(n-1) + (n-1)*a(n-2), a(0) = 1, a(1) = 1.at n=14A000255Bisection of A000255.at n=7A100444Number of permutations of {1,2,...,n} in which the fixed points and the non-fixed points alternate.at n=29A162969