153735domain: NAppears in sequencesTriangular numbers with only odd digits.at n=24A117960Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (-1, 0, 1), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.at n=9A149785