1444437domain: NAppears in sequencesNumber of (n+2) X (1+2) 0..1 arrays with no 3 x 3 subblock diagonal sum 1 and no antidiagonal sum 1 and no row sum 0 or 1 and no column sum 0 or 1.at n=13A255152Number of self-inverse double cosets in D_n\S_n/D_n.at n=13A384631