4808643120

Appears in sequences

• a(n) = (2n+1)!/n!^2.at n=15A002457
• First numerator and then denominator of central elements of Leibniz's Harmonic Triangle.at n=31A046212
• Swinging factorial, a(n) = 2^(n-(n mod 2))*Product_{k=1..n} k^((-1)^(k+1)).at n=31A056040
• a(n) = n!/(k!)^2, where k is the largest number such that (k!)^2 divides n!.at n=30A056042
• G.f. A(x) satisfies A(x) = 1 + 4*x*A(x)^(3/2).at n=11A214377
• a(n) = 2^n*binomial((n + 1 + (n mod 2))/2, 1/2).at n=30A242172
• a(n) = A(n) if n is even else a(n) = A(n)*(n-1)/(n+1) with A(n) = ((n-1)!/ floor((n-1)/2)!^2).at n=31A274707
• Numerators of the ratio of the symmetry-constrained bound to the adiabatic bound on polarization transfer in AXn spin-1/2 systems.at n=30A362534
• Numerators of the ratio of the symmetry-constrained bound to the adiabatic bound on polarization transfer in AXn spin-1/2 systems.at n=31A362534