2449440

Appears in sequences

• Expansion of e.g.f. x*(1-x)/(1-3*x).at n=7A052700
• Unrelated-factorial numbers: product of numbers unrelated to n (numbers which have a common divisor with n but do not divide n).at n=20A070251
• Triangle T(n,k) of numbers of connected (unicyclic) graphs with unique cycle of length k (3<=k<=n), on n labeled nodes.at n=24A098909
• a(n) = A002952(n) + A002953(n).at n=22A180277