101656domain: NAppears in sequencesa(n) = (19/28)*(3^n-1)*P(n-1)+(3/7)*(4*3^n-5)*P(n) where P() are the Pell numbers A000129.at n=5A187919Number of nX5 0..1 arrays with every element unequal to 0, 1, 3 or 8 king-move adjacent elements, with upper left element zero.at n=14A304218