2179053domain: NAppears in sequencesa(n) = Sum_{k=0..n} (k+1) * A026615(n,k).at n=17A026960Number 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, 1), (-1, 1, 1), (0, 1, 0), (1, -1, 1), (1, 0, -1)}.at n=12A148485