412316860417domain: NAppears in sequencesa(n) = 6*4^n + 1.at n=18A199116a(n) = 6*8^n+1.at n=12A199554Half the number of (n+1) X 7 0..2 arrays with every 2 X 2 subblock having exactly two distinct clockwise edge differences.at n=9A209532