224808

Appears in sequences

• a(n) = (4*n+1)*binomial(3*n,n)/(2*n+1).at n=7A052227
• Expansion of (1+x^3*C)*C, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.at n=12A071726
• Central terms of the triangle A182579.at n=15A182584
• Antidiagonal sums of the convolution array A213561.at n=15A213563
• a(n) = Sum_{k=0..floor(n/2)} binomial(k+3,4*n-8*k+3).at n=39A390040