613052domain: NAppears in sequencesa(n) = Sum{T(i,j)}, 0<=i<=n, 0<=j<=n, T given by A026681.at n=16A026690Number 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, -1), (-1, -1, 0), (-1, 0, -1), (1, 0, 1), (1, 1, 1)}.at n=10A150675