99414

Appears in sequences

• Irregular triangle: the coefficient [x^k] of the polynomial (1-x)^(2*n-1) * Sum_{s>=0} A001263(n+2*s,2*s+1)*x^s in row n >= 1 and column k >= 0.at n=45A178657
• a(n) = Sum_{k=0..n} (-1)^k * binomial(4*k,n-k) * Catalan(k).at n=16A360085