598401domain: NAppears in sequencesNumber of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (-1, 1, 1), (0, 0, 1), (1, 0, -1)}.at n=13A148296Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and nonnegative determinant.at n=16A211147