Number of n-colorings of the octahedral graph.

Terms

a(0) =0a(1) =0a(2) =0a(3) =6a(4) =96a(5) =780a(6) =4080a(7) =15330a(8) =45696a(9) =115416a(10) =257760a(11) =523710a(12) =987360a(13) =1752036a(14) =2957136a(15) =4785690a(16) =7472640a(17) =11313840a(18) =16675776a(19) =24006006a(20) =33844320a(21) =46834620a(22) =63737520a(23) =85443666a(24) =112987776a(25) =147563400a(26) =190538400a(27) =243471150a(28) =308127456