2124340

Appears in sequences

• Expansion of ((1 + 2 * Sum_{k>=1} q^(k^2))^16 - 1) / 32.at n=11A302855
• a(n) = 1 + Sum_{k=0..n-1} (2*k+1) * a(k) * a(n-k-1).at n=7A376125