2699004domain: NAppears in sequencesa(n) = floor(n^(3/2))*floor(1 + n^(3/2))*floor(2 + n^(3/2))/6.at n=39A185592Number of -n..n arrays x(0..5) of 6 elements with zero sum and no two neighbors summing to zero.at n=10A199835a(n) = Sum_{k=0..floor(n/3)} binomial(n+k-1,k) * binomial(k,n-3*k).at n=20A389290