58359domain: NAppears in sequencesTriangle, read by rows, T(n,k) = k*Sum_{i=0..n-k} C(2*i+2*k,i)*C(n-i-1,k-1)/(i+k) for 1 <= k <= n.at n=47A257488Expansion of Product_{k>=1} 1/(1 - x^k)^((3*k+1)*binomial(k+2,3)/4).at n=9A317017Number of distinct lines passing through exactly two points in a triangular grid of side n.at n=33A362014