1251320145

Appears in sequences

• Central coefficient of Product_{k=0..n} (1+k*x)^2.at n=8A129256
• a(n) = Sum_{k=0..2*n} Stirling1(2*n+1, 2*n+1-k) * Stirling1(2*n+1, k+1).at n=4A384028