150903

Appears in sequences

• (s(n)+s(n+1))/6, where s()=A006521.at n=33A016059
• Odd numbers divisible by exactly 9 primes (counted with multiplicity).at n=14A046322
• Numbers n such that n | 3^n + 2^n + 1^n.at n=30A056645
• Numbers n such that n | 6^n + 5^n + 1.at n=27A057299
• Number of ways to arrange 4 nonattacking triangular rooks on an nXnXn triangular grid.at n=11A193982
• The number of nonequivalent root ancestral configurations in a recursively defined family of gene trees and species trees with at least n = 9 leaves, in which for n >= 12 leaves, 3-leaf trees are successively added at the root of the tree with n-3 leaves.at n=24A355118