Number T(n,k) of labeled cyclic chord diagrams with n chords such that every chord has length at least k; triangle T(n,k), n>=1, 1<=k<=n, read by rows.
A324428
Number T(n,k) of labeled cyclic chord diagrams with n chords such that every chord has length at least k; triangle T(n,k), n>=1, 1<=k<=n, read by rows.
Terms
- a(0) =1a(1) =3a(2) =1a(3) =15a(4) =4a(5) =1a(6) =105a(7) =31a(8) =7a(9) =1a(10) =945a(11) =293a(12) =68a(13) =11a(14) =1a(15) =10395a(16) =3326a(17) =837a(18) =159a(19) =18a(20) =1a(21) =135135a(22) =44189a(23) =11863a(24) =2488a(25) =381a(26) =29a(27) =1a(28) =2027025a(29) =673471
External references
- oeis: A324428