Number T(n,k) of reduced decompositions for all permutations of [n] with exactly k inversions; triangle T(n,k), n>=0, 0<=k<=n*(n-1)/2, read by rows.
A289778
Number T(n,k) of reduced decompositions for all permutations of [n] with exactly k inversions; triangle T(n,k), n>=0, 0<=k<=n*(n-1)/2, read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =2a(7) =2a(8) =1a(9) =3a(10) =6a(11) =10a(12) =14a(13) =16a(14) =16a(15) =1a(16) =4a(17) =12a(18) =30a(19) =68a(20) =132a(21) =252a(22) =412a(23) =614a(24) =768a(25) =768a(26) =1a(27) =5a(28) =20a(29) =68
External references
- oeis: A289778