The number of different 4-colorings for the vertices of all triangulated planar polygons on a base with n vertices if the colors of two adjacent boundary vertices are fixed.
A174395
The number of different 4-colorings for the vertices of all triangulated planar polygons on a base with n vertices if the colors of two adjacent boundary vertices are fixed.
Terms
- a(0) =0a(1) =2a(2) =10a(3) =40a(4) =140a(5) =462a(6) =1470a(7) =4580a(8) =14080a(9) =42922a(10) =130130a(11) =393120a(12) =1184820a(13) =3565382a(14) =10717990a(15) =32197660a(16) =96680360a(17) =290215842a(18) =870997050a(19) =2613690200a(20) =7842468700a(21) =23530202302a(22) =70596199310a(23) =211799782740a(24) =635421717840
External references
- oeis: A174395