1164240

Appears in sequences

• a(n) = (n+2) * (2n+1) * (2n-1)! / (n-1)!.at n=5A002691
• Least common multiple of all cycle sizes in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506.at n=9A060114
• Coefficient triangle of generalized Laguerre polynomials n!*L(n,4,x) (rising powers of x).at n=30A062140
• Third (unsigned) column sequence of triangle A062140 (generalized a=4 Laguerre).at n=5A062260
• Number of functions f:{1,2,...,n}->{1,2,...,n} such that Im(f) contains 5 fixed elements.at n=3A126232
• Triangle T(n,k)=number of forests of labeled rooted trees with n nodes, containing exactly k trees of height one, all others having height zero (n>=0, 0<=k<=floor(n/2)).at n=41A133399
• a(n) = the smallest positive integer with exactly n positive "non-isolated divisors". A divisor, k, of n is non-isolated if (k-1) or (k+1) also divides n.at n=33A133996
• A partition product of Stirling_2 type [parameter k = -3] with biggest-part statistic (triangle read by rows).at n=33A157399
• Triangular array T(n,k): functions f:{1,2,...,n}-> {1,2,...,n} such that each of k fixed (but arbitrary) elements are in the image of f.at n=41A174551
• Series reversion of (1 - t*x)*log(1 + x) with respect to x.at n=26A198204
• Number of nX1 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to one or two horizontal or vertical neighbors.at n=26A199358
• a(n) = Pell(n)*A008653(n) for n>=1, with a(0)=1, where A008653 is the theta series of direct sum of 2 copies of hexagonal lattice.at n=12A209447
• Triangle read by rows, coefficients of the polynomials P(n,x) = (-1)^n*hypergeom( [n,-n], [], x), powers in descending order.at n=30A278071
• Triangle read by rows: T(n,k) is the number of rows of n colors with exactly k different colors counting chiral pairs as equivalent, i.e., the rows are reversible.at n=42A305621
• Triangle read by rows: T(n,k) is the number of chiral pairs of rows of n colors with exactly k different colors.at n=42A305622
• Ordered lone-child-avoiding trees where vertices have decreasing subtree sizes.at n=24A346787
• a(n) is the smallest number that has exactly n divisors that are digitally balanced numbers (A031443).at n=37A357035
• Triangle read by rows: T(n, k) = binomial(n, k) * Pochhammer(n, k).at n=33A370706
• Triangle read by rows: T(n,k) = Sum_{j=0..k} (-1)^(k-j) * binomial(k,j) * (3+j)^n.at n=41A391552