Triangle read by rows: T(n,k) is the number of achiral colorings of the edges of a regular n-D orthotope (or ridges of a regular n-D orthoplex) using exactly k colors. Row n has n*2^(n-1) columns.
A338145
Triangle read by rows: T(n,k) is the number of achiral colorings of the edges of a regular n-D orthotope (or ridges of a regular n-D orthoplex) using exactly k colors. Row n has n*2^(n-1) columns.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =3a(4) =0a(5) =1a(6) =68a(7) =1200a(8) =7268a(9) =20025a(10) =27750a(11) =18900a(12) =5040a(13) =0a(14) =0a(15) =0a(16) =0a(17) =1a(18) =93022a(19) =293878020a(20) =90807857080
External references
- oeis: A338145