545140domain: NAppears in sequencesNumbers k such that k+1, k^2+1, k^4+1 and k^8+1 are primes.at n=9A070655Number of 5 X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=8A208015