733900domain: NAppears in sequencesConjecturally, number of infinitely recurring prime patterns of width 2n-1.at n=37A023189Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=21A253836