679757

Appears in sequences

• a(n) = Sum_{k=0..n} (k+1) * Sum_{j=0..n} 2^j*binomial(n,j)*binomial(n-k,j).at n=8A035029
• Duplicate of A035029.at n=9A049607
• Expansion of Product_{k>=1} 1/(1 - x^k * (1 + k*x)).at n=21A336976