446581domain: NAppears in sequencesa(n) = (11^(2^n)-1)/2^(n+2)/15.at n=2A068533Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=8A301319