41068domain: NAppears in sequencesa(n) = index of first derangement of 1..n (n>=2).at n=7A134316Number of (n+2) X (5+2) 0..1 arrays with no 3 x 3 subblock diagonal sum 1 and no antidiagonal sum 2 and no row sum 0 and no column sum 3.at n=27A255798Expansion of Product_{k>=1} (1 + 2*x^k - x^(2*k)).at n=48A293182