759634domain: NAppears in sequencesNumber of increasing runs of even length in all permutations of [n].at n=9A097593Number 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, 1, -1), (1, 0, 1), (1, 1, -1)}.at n=13A148584