1051197507

Appears in sequences

• Diagonal sums of inverse of Riordan array (1/(1-x^4),x/(1-x^4)).at n=24A156065
• a(n) = Sum_{k=0..n} (-1)^k * (2*k+1) * binomial(4*n-2*k+1,n-k)/(4*n-2*k+1).at n=12A390740