206514domain: NAppears in sequencesNumber of nX5 0..1 arrays avoiding 0 0 1 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically.at n=6A207251Number of 7 X n 0..1 arrays avoiding 0 0 1 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically.at n=4A207258Composite numbers k such that k*phi(k) is in A002378.at n=30A256545