158175

Appears in sequences

• Number of connected topologies on n labeled points.at n=6A001929
• a(n) = 225*(n-1)*(n-2)/2.at n=36A027470
• a(n) = Sum_{i=1..n} (3i)^2.at n=37A220443
• Triangular array read by rows: T(n,k) is the number of pre-orders on an n-set with exactly k connected components in its digraph representation, n>=1, 1<=k<=n.at n=15A247232
• Number of orbits of Aut(Z^7) as function of the infinity norm n of the representative lattice point of the orbit, when the cardinality of the orbit is equal to 80640.at n=38A266396