137846528820
domain: N
Appears in sequences
- Central binomial coefficients: binomial(2*n,n) = (2*n)!/(n!)^2.at n=20A000984
- a(n) = binomial(4n,2n) or (4*n)!/((2*n)!*(2*n)!).at n=10A001448
- Binomial coefficient C(40,n).at n=20A010956
- a(n) = binomial(n,20).at n=20A010973
- Expansion of 1/(1-4*x)^(21/2).at n=10A020932
- Numerator of binomial(2n,n)/(2n+1).at n=20A056616
- Binomial(2k,k) when the first digit of binomial(2k,k) is 1.at n=5A068359
- Smallest integer of the form product (n+1)(n+2)...(n+k)/n!.at n=20A075055
- Expansion of 2sinh(x) + BesselI_0(2x).at n=40A081668
- a(n) = binomial coefficient C(m,k) with minimal (m,k) and exactly n distinct digits in decimal representation.at n=8A101599
- a(n) = Sum_{k = 0..n} binomial(n,floor(k/2))*(-1)^(n-k).at n=40A126869
- Expansion of 1/sqrt(1-4*x) - x/sqrt(1-4*x^2).at n=20A129369
- A trisection of A001405 (central binomial coefficients): binomial(3n+1,floor((3n+1)/2)), n >= 0.at n=13A187443