136100domain: NAppears in sequencesNumerators of continued fraction convergents to sqrt(420).at n=4A041798Number 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, 0, 0), (1, 1, 1)}.at n=9A150495