226538domain: NAppears in sequencesNumber of n X 3 0..1 arrays with every element equal to 0, 1, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=34A302510Expansion of 1/(1 - x/(1 - 9*x)^(1/3))^2.at n=7A382543