135072

Appears in sequences

• Number of primes less than 100000n.at n=17A038814
• Number of 3-block covers of a labeled n-set.at n=5A095152
• a(n) = 2*a(n-1) + 2*a(n-2) - 2*a(n-3) with a(0)=3, a(1)=2, a(3)=8.at n=13A107300
• Triangle T(n,k), n >= 0, 0 <= k <= n, read by rows: T(n,k) is the number of forests of trees on n or fewer nodes using a subset of labels 1..n and k edges.at n=48A144258
• G.f. = Phi^5, where Phi = g.f. for A028930.at n=30A328530
• Number of compositions (ordered partitions) of n into an odd number of squares.at n=38A339419