81235

Appears in sequences

• a(n) = floor( n*(n-1)*(n-2)*(n-3)/27 ).at n=40A011937
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 57.at n=4A031735
• Number of set partitions of [n] with minimal block length multiplicity equal to three.at n=9A271763
• a(n) = (n - 1)*n*(2*n^2 + 4*n - 1)/6.at n=22A330700