Triangle read by rows: T(n,k) is the number of rows of n colors with exactly k different colors counting chiral pairs as equivalent, i.e., the rows are reversible.
A305621
Triangle read by rows: T(n,k) is the number of rows of n colors with exactly k different colors counting chiral pairs as equivalent, i.e., the rows are reversible.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =3a(6) =1a(7) =8a(8) =18a(9) =12a(10) =1a(11) =18a(12) =78a(13) =120a(14) =60a(15) =1a(16) =34a(17) =273a(18) =780a(19) =900a(20) =360a(21) =1a(22) =70a(23) =921a(24) =4212a(25) =8400a(26) =7560a(27) =2520a(28) =1a(29) =134
External references
- oeis: A305621