244406613domain: NAppears in sequencesExpansion of g.f. 1/(1 - 3*x + 2*x^3).at n=19A077846Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,3,1,1,0 for x=0,1,2,3,4.at n=12A197499