2363904400
domain: N
Appears in sequences
- a(n) = binomial(2n, n)^2.at n=9A002894
- a(n) = binomial(n, floor(n/2))^2 = A001405(n)^2.at n=18A018224
- Expansion of (1+4x)/AGM(1+4x,1-4x) where AGM denotes the arithmetic-geometric mean.at n=18A092266
- Norm of coefficients in g.f. C(x) that satisfies: C(x) = 1 + x/C(I*x).at n=38A193384
- a(n) = binomial(n,floor(n/2))*binomial(n+1,floor(n/2+1/2))*(1+floor(n/2))/(1+2*floor(n/2)).at n=18A241530
- a(n) = (n!/floor(n/2)!^2)^2.at n=18A327998