68671domain: NAppears in sequencesa(n) = floor( binomial(n,7)/7 ).at n=25A011853Number 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), (0, 1, -1), (1, 0, 1), (1, 1, -1), (1, 1, 1)}.at n=8A150952a(n) = 1/7*( binomial(n,7) - floor(n/7) ).at n=17A215053