2328480

Appears in sequences

• Largest number in n-th row of triangle A019538.at n=9A002869
• Triangle of numbers T(n,k) = k!*Stirling2(n,k) read by rows (n >= 1, 1 <= k <= n).at n=42A019538
• a(n) = n*(3*n+1)*(n+2)!/24.at n=7A037960
• Second (unsigned) column sequence of triangle A062140 (generalized a=4 Laguerre).at n=6A062199
• Numbers k such that sigma(k) - usigma(k) > 3k.at n=8A063875
• Numbers m such that m^2 + (reversal of m)^2 is a square. (Leading 0's are ignored.)at n=7A068536
• T(n, k) = Sum_{j=0..n-k} (-1)^j*binomial(n - k + 1, j)*(n - k + 1 - j)^n. Triangle read by rows, T(n, k) for 1 <= k <= n.at n=38A090582
• Triangle read by rows: T(n,h)/(n-1), where T is the array in A101819.at n=34A101820
• a(n) = (2*n+1)!*(2*n-2)!/(2*((n-1)!)*(n!)^2), n=1,2,... .at n=4A113677
• Triangle of numbers T(n,k) = k!*Stirling2(n,k) = A000142(k)*A048993(n,k) read by rows, T(n, k) for 0 <= k <= n.at n=52A131689
• Number of surjections from an n-element set onto a seven-element set.at n=2A135456
• Number L([n],m) of ways the labeled parts of each integer partition of n can be distributed into m nonempty labeled boxes.at n=42A139359
• a(n) = (2*n)! * (2*n+1)! / ((n+1)^2 * n!^3).at n=5A204515
• Exponential generating function = (1+x)^(1+x^2).at n=11A247212
• Triangle read by rows, T(n,k) = (k+1)*(n+1)!*(n+k)!/((k+1)!^2*(n-k)!) with n >= 0 and 0 <= k <= n.at n=26A253284
• Coefficients of the signed Fubini polynomials in ascending order, F_n(x) = Sum_{k=0..n} (-1)^n*Stirling2(n,k)*k!*(-x)^k.at n=52A278075
• Triangle read by rows: T(n,k) (n>=1, 3<=k<=n+2) is the number of k-sequences of balls colored with n colors such that exactly two balls are of a color seen previously in the sequence.at n=27A281944
• Triangle Read by rows: T(n,k) is the number of rooted ordered trees with n non-root nodes with non-root node labels in {1,..,k} such that all labels appear at least once in all groups of sibling nodes.at n=52A385123