3707509

Appears in sequences

• Crystal ball sequence for 6-dimensional cubic lattice.at n=18A001848
• a(n) = T(3n,n), where T = Delannoy triangle (A008288).at n=6A026001
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) = Sum_{j=0..n} binomial(k*n,n-j) * binomial(k*n+j,j).at n=51A341470