45570

Appears in sequences

• Sums of groups in A075643.at n=40A075645
• Symmetrical product form polynomial as triangle sequence coefficients: q(x,n)=Product[x + 2*n - i + 1, {i, 0, n - 1}]; p(x,n)=q(x,n)+x^2+x^n*q(1/x,m);t(n,m)=coefficients(p(x,n).at n=24A155725
• a(n) is the number of compositions of the set {1, 2, ..., n} into blocks, each of size 1, 2 or 3 (n >= 0).at n=7A189886
• Number of partitions of n in which any two parts differ by at most 9.at n=47A218511
• Numbers n such that n^2 is a sum of 2 and also of 4 consecutive primes.at n=39A252066
• Number A(n,k) of ordered set partitions of [n] with at most k elements per block; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=62A276921
• Unitary practical numbers that are nonsquarefree.at n=35A287173
• Number of ordered partitions of an n-set into blocks of size <= n/2.at n=7A368512
• Expansion of e.g.f. (1/x) * Series_Reversion( x*(1 - x^3*exp(x)) ).at n=7A370985
• Numbers k such that sigma(k) = psi(k) + tau(k)^2.at n=39A390296