551754domain: NAppears in sequencesNumber of (n+2) X (1+2) 0..1 arrays with no 3 x 3 subblock diagonal sum 0 and no antidiagonal sum 3 and no row sum 1 and no column sum 1.at n=28A257440a(n) = Sum_{d|n} d * binomial(n,d).at n=17A367864