204549domain: NAppears in sequencesa(n) = floor( e^((n/2)*arccosh(1+sqrt(2))) ).at n=16A093698Number of 7Xn 0..1 arrays with every element equal to 0, 1, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=7A302432