Number of achiral colorings of the edges of a cube or regular octahedron.

Terms

a(0) =1a(1) =70a(2) =1407a(3) =12480a(4) =69050a(5) =281946a(6) =931490a(7) =2632512a(8) =6598935a(9) =15041950a(10) =31740841a(11) =62830560a(12) =117855192a(13) =211141490a(14) =363551700a(15) =604679936a(16) =975561405a(17) =1531968822a(18) =2348375395a(19) =3522668800a(20) =5181705606a(21) =7487800650a(22) =10646250902a(23) =14913998400a(24) =20609541875a(25) =28124211726