117244domain: NAppears in sequencesa(n) = 4 + 8*n + 10*n^2 + 4*n^3.at n=30A100207Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of n steps taken from {(-1, 0), (-1, 1), (0, -1), (0, 1), (1, 0)}.at n=12A151363