817743

Appears in sequences

• a(n) = n^4 + (9/2)*n^3 + n^2 - (9/2)*n + 1.at n=29A003878
• Square array T(n,k), n>=0, k>=0, read by antidiagonals, where T(0,k) = 1 and T(n,k) = (1/n) * Sum_{j=1..n} 3^j * binomial(n,j) * binomial(k*n,j-1) for n > 0.at n=60A336575
• a(0) = 1 and a(n) = (1/n) * Sum_{k=1..n} 3^k * binomial(n,k) * binomial(n^2,k-1) for n > 0.at n=5A336578