1367187domain: NAppears in sequencesa(n) = (6*n+1)*(6*n+3)*(6*n+5).at n=18A001520Sum_{T(i,j)}, 0<=j<=i, 0<=i<=n, where T is the array in A026386.at n=16A026396a(n) = (4*n+1)*(4*n+3)*(4*n+5).at n=27A133766a(n) = (7*5^n - 1)/2.at n=8A198766