-77558760

Appears in sequences

• a(n) = binomial(2*n-1, n)*(-1)^n.at n=15A110556
• Inverse binomial transform of A005043.at n=29A126930
• G.f. A(x) = 1 + 4*x*A(x)^(1/2); A(x) = 1 + 8*x^2 + 4*x*sqrt(1 + 4*x^2).at n=33A135863
• Smallest Euler characteristic of a downset on an n-dimensional cube.at n=29A214283
• First term of n-th difference sequence of (round(k*sqrt(5))), k >= 0.at n=29A325842