358701domain: NAppears in sequencesSixth column (m=5) of (1,6)-Pascal triangle A096956.at n=27A096959Triangle, read by rows, T(n, k) = binomial(3*n, 2*k) + binomial(3*n, 2*(n-k)).at n=30A154919Triangle, read by rows, T(n, k) = binomial(3*n, 2*k) + binomial(3*n, 2*(n-k)).at n=33A154919