519568

Appears in sequences

• Expansion of 1 / (1 - x - x^2 + x^3 - x^5 + x^15 - x^17 - x^18 + x^19 + x^20).at n=37A174650
• a(n) = Sum_{k=0..n} (k+1) * 2^k * binomial(2*k+1,2*n-2*k).at n=8A391895