182880

Appears in sequences

• Balanced refactorable numbers.at n=15A078543
• Numbers such that UnitaryPhi(2*UnitaryPhi(n)) = n.at n=12A117820
• Triangle T(n, k) = n!*StirlingS2(n, k)/binomial(n, k), read by rows.at n=38A156815
• Numbers n such that sigma(n) = 13*phi(n) (where sigma=A000203, phi=A000010).at n=9A171258
• a(n) = (4^(n + 1) - 2)*(2*n)!.at n=3A331839
• Number of unordered pairs of self-avoiding paths with nodes that cover all vertices of a convex n-gon.at n=9A332426
• Denominators of an approximation to zeta(n)/Pi^n.at n=6A340471
• Triangle read by rows: T(n,k) is the number of sets of noncrossing paths of size k that cover n nodes arranged in a circle with one node paths disallowed, 0 <= k <= floor(n/2).at n=32A390893