1,2

Eric Weisstein's World of Mathematics, Polyhedron Coloring

(1/60)*n^12+(1/4)*n^6+(11/15)*n^4;

Cf. A006550.

Sequence in context: A004392 A093296 A093248 this_sequence A008702 A133402 A117846

Adjacent sequences: A000542 A000543 A000544 this_sequence A000546 A000547 A000548

nonn,easy

Clint. C. Williams [ Clintwill(AT)aol.com ]