Number of unordered pairs of 5-colorings of an n-wheel that differ in the coloring of exactly one vertex.

A309380

Number of unordered pairs of 5-colorings of an n-wheel that differ in the coloring of exactly one vertex.

Terms

    a(0) =180a(1) =240a(2) =1380a(3) =4200a(4) =15420a(5) =52080a(6) =177780a(7) =595320a(8) =1978860a(9) =6515520a(10) =21298980a(11) =69168840a(12) =223369500a(13) =717772560a(14) =2296480980a(15) =7319252760a(16) =23247851340a(17) =73615135200a(18) =232462779780a(19) =732245695080

External references