128670domain: NAppears in sequencesa(n) = Sum_{k=1..n} A145518(n,k).at n=13A145519Number 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), (0, -1, 0), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.at n=10A149332