26945

Appears in sequences

• a(n) = (2*n - 1)*(24*n^2 - 42*n + 19).at n=8A160174
• The function W_n(6) (see Borwein et al. reference for definition).at n=16A169711
• a(0)=a(1)=1, a(n) = least k > a(n-1) such that k*a(n-2) is a triangular number.at n=36A214961
• Number of sequences with 5 copies each of 1,2,...,n avoiding the pattern 12...n.at n=3A269115
• Number of sequences with n copies each of 1,2,3 avoiding the pattern 123.at n=5A269121
• Number A(n,k) of sequences with k copies each of 1,2,...,n avoiding the pattern 12...n; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=39A269129
• Numbers of the form p*q*r where p, q, r are distinct primes congruent to 1 mod 4 such that Legendre(p/q) = Legendre(p/r) = Legendre(q/r) = -1.at n=25A323271
• a(n) = Sum_{k=1..n} sigma_3(k) * floor(n/k).at n=16A356043