31752000

Appears in sequences

• Coefficients of Laguerre polynomials.at n=6A001811
• Triangle T(n,k) read by rows: number of labeled trees with n nodes and k leaves, n >= 2, 2 <= k <= n.at n=39A055314
• Number of labeled trees with n nodes and 5 leaves.at n=4A055317
• Denominator(sum(i=1,n,1/i^4))/denominator(sum(i=1,n,1/i^2)).at n=9A069046
• Number of non-attacking placements of 6 rooks on an n X n board.at n=9A179061
• Numbers k such that uphi(k)/phi(k) > uphi(m)/phi(m) for all m < k, where phi(k) is the Euler totient function (A000010) and uphi(k) is the unitary totient function (A047994).at n=35A283052
• Coreful 4-abundant numbers: numbers k such that csigma(k) > 4*k, where csigma(k) is the sum of the coreful divisors of k (A057723).at n=8A340110
• Numbers k such that k and the next three numbers after k with the same prime signature as k also have the same set of distinct prime divisors as k.at n=9A340304
• Number of labeled trees covering 2n nodes, half of which are leaves.at n=4A358732
• a(n) = Product_{k=1..w(n)} p(k)^(S(n,k)-1), where set S(n,k) = row n of A272011 and w(n) = A000120(n) is the binary weight of n.at n=46A362227