204138domain: NAppears in sequencesExpansion of 2x(1-x)/(1-2x-x^2+x^3).at n=16A0529943-wave sequence beginning with 2's.at n=30A060827Number of nX4 0..1 arrays with every element unequal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.at n=8A304015