119599domain: NAppears in sequencesNumber of arrays of 4 integers in -n..n with sum zero and equal numbers of elements greater than zero and less than zero.at n=30A201812Number of (n+2) X (1+2) 0..1 arrays with no 3 x 3 subblock diagonal sum 0 and no antidiagonal sum 0 and no row sum 2 and no column sum 2.at n=24A255221