198450

Appears in sequences

• Expansion of e.g.f. exp(arctanh(x)+log(x+1)).at n=9A013155
• Even refactorable numbers k such that the number r of odd divisors and the number s of even divisors are both odd divisors of k and k is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of k.at n=12A120358
• Even refactorable numbers k such that the number r of odd divisors of k and the number s of even divisors of k are both odd divisors of k.at n=40A120361
• Numerators of coefficients of series expansion of 1/(Bernoulli trial entropy), scaled to denominators A091137.at n=42A145178
• Symmetrical Hahn weights on q-form factorials:m=3;q=4; q-form:t(n,m)=If[m == 0, n!, Product[Sum[(m + 1)^i, {i, 0, k - 1}], {k, 1, n}]]; Hahn weight:b(n,k,m)=If[n == 0, 1, (n!*t[m + 1, k]*t[m + 1, n - k])/(k!*(n - k)!*t[1, n])].at n=4A157322
• Triangular sequence from coefficients of the polynomial recursion: p(x,n)=Sum[Binomial[n, m]*p[x, m]*p[x, n - m - 1], {m, 0, n - 1}].at n=21A157526
• Triangle related to the asymptotic expansion of E(x,m=3,n).at n=41A163932
• a(n) = A203309(n)/A000178(n) where A000178 are superfactorials.at n=5A203467
• Triangle read by rows, Lah numbers of order 3, T(n,n) = 1, T(n,k) = 0 if k<0 or k>n, otherwise T(n,k) = T(n-1,k-1)+((n-1)^3+k^3)*T(n-1, k), for n>=0 and 0<=k<=n.at n=33A269946
• a(n) = A059897(A260443(n), A260443(1+n)).at n=20A284577
• a(n) = A059897(A260443(n), A260443(1+n)).at n=42A284577
• a(n) is the least number with exactly n odd divisors that are <= sqrt(n).at n=24A334853
• Number of rooted binary phylogenetic trees with n leaves and minimal Sackin tree balance index.at n=9A344934
• a(n) = 2^(1-3*n)*((2*n)!)^2/n.at n=3A372184