1676116domain: NAppears in sequencesa(n) = Sum_{k=0..6} binomial(n,k).at n=34A008859Number 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,-1,1), (0,1,-1), (1,1,1)}.at n=12A149430