Triangle read by rows: T(n,k) is the number of chiral pairs of rows of n colors with exactly k different colors.

A305622

Triangle read by rows: T(n,k) is the number of chiral pairs of rows of n colors with exactly k different colors.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =0a(4) =2a(5) =3a(6) =0a(7) =6a(8) =18a(9) =12a(10) =0a(11) =12a(12) =72a(13) =120a(14) =60a(15) =0a(16) =28a(17) =267a(18) =780a(19) =900a(20) =360a(21) =0a(22) =56a(23) =885a(24) =4188a(25) =8400a(26) =7560a(27) =2520a(28) =0a(29) =120

External references