Triangle read by rows: T(n,k) is the number of achiral colorings of the edges of a regular n-D orthoplex (or ridges of a regular n-D orthotope) using exactly k colors. Row 1 has 1 column; row n>1 has 2*n*(n-1) columns.
A338149
Triangle read by rows: T(n,k) is the number of achiral colorings of the edges of a regular n-D orthoplex (or ridges of a regular n-D orthotope) using exactly k colors. Row 1 has 1 column; row n>1 has 2*n*(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) =8198a(19) =9055962a(20) =1467050480a(21) =74035775370
External references
- oeis: A338149