155776domain: NAppears in sequencesNumber of permutations of 1..n with displacements restricted to {-6,-5,-4,-2,-1,0,3}.at n=15A189596E.g.f.: 1 / (1 - x * exp(-2*x)).at n=8A336959Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,k) = n! * Sum_{j=0..n} (-k * (n-j))^j/j!.at n=63A351791