4294909952domain: NAppears in sequencesa(n) = 6*a(n-1)-8*a(n-2) for n > 1; a(0) = 57, a(1) = 242.at n=13A176635Sum of neighbor maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nX2 array.at n=15A222445