Triangle read by rows: T(n,k) = number of connected matchings with n crossings and k chords, in a disk, k=2..n+1.
A232223
Triangle read by rows: T(n,k) = number of connected matchings with n crossings and k chords, in a disk, k=2..n+1.
Terms
- a(0) =1a(1) =0a(2) =3a(3) =0a(4) =1a(5) =12a(6) =0a(7) =0a(8) =10a(9) =55a(10) =0a(11) =0a(12) =4a(13) =77a(14) =273a(15) =0a(16) =0a(17) =1a(18) =60a(19) =546a(20) =1428a(21) =0a(22) =0a(23) =0a(24) =35a(25) =624a(26) =3740a(27) =7752a(28) =0a(29) =0
External references
- oeis: A232223