126718domain: NAppears in sequencesEngel expansion of sin(2).at n=13A067920Number 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, 1), (0, 0, -1), (0, 1, 0), (1, 0, 1), (1, 1, 1)}.at n=8A151202