79332domain: NAppears in sequencesExpansion of 1 / Product_{k>=1} (1-x^k-x^(2*k)).at n=21A162891Number of n X 3 0..1 arrays with every element unequal to 0, 1, 2, 3 or 7 king-move adjacent elements, with upper left element zero.at n=12A304770