Number of unordered pairs of 4-colorings of an n-cycle that differ in the coloring of exactly one vertex.
A326347
Number of unordered pairs of 4-colorings of an n-cycle that differ in the coloring of exactly one vertex.
Terms
- a(0) =36a(1) =240a(2) =780a(3) =2952a(4) =10164a(5) =35040a(6) =118044a(7) =393720a(8) =1299012a(9) =4251600a(10) =13817388a(11) =44641128a(12) =143488980a(13) =459165120a(14) =1463588412a(15) =4649045976a(16) =14721978468a(17) =46490458800a(18) =146444944716a(19) =460255541064
External references
- oeis: A326347