311247domain: NAppears in sequencesNumber of n X n binary arrays symmetric under 90-degree rotation with all ones connected in a 3 X 2 elbow 1,1 1,2 1,3 2,3 in any orientation.at n=12A145949Expansion of Product_{k>=0} (1 + (2*k + 1)*x^(2*k+1)).at n=44A282207