Number of unordered pairs of 4-colorings of an n-wheel that differ in the coloring of exactly one vertex.

A309379

Number of unordered pairs of 4-colorings of an n-wheel that differ in the coloring of exactly one vertex.

Terms

    a(0) =36a(1) =0a(2) =108a(3) =120a(4) =444a(5) =840a(6) =2124a(7) =4536a(8) =10332a(9) =22440a(10) =49260a(11) =106392a(12) =229500a(13) =491400a(14) =1048716a(15) =2228088a(16) =4718748a(17) =9961320a(18) =20971692a(19) =44040024a(20) =92274876a(21) =192937800a(22) =402653388a(23) =838860600a(24) =1744830684a(25) =3623878440a(26) =7516193004a(27) =15569256216a(28) =32212254972a(29) =66571992840

External references