Triangle T(n,k) read by rows: number of permutations in [n] with exactly k ascents that have an odd number of inversions.

A128613

Triangle T(n,k) read by rows: number of permutations in [n] with exactly k ascents that have an odd number of inversions.

Terms

    a(0) =0a(1) =1a(2) =0a(3) =1a(4) =2a(5) =0a(6) =0a(7) =6a(8) =6a(9) =0a(10) =0a(11) =12a(12) =36a(13) =12a(14) =0a(15) =1a(16) =29a(17) =147a(18) =155a(19) =28a(20) =0a(21) =1a(22) =64a(23) =586a(24) =1208a(25) =605a(26) =56a(27) =0a(28) =0a(29) =120

External references