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

A128612

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

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =1a(6) =1a(7) =5a(8) =5a(9) =1a(10) =1a(11) =14a(12) =30a(13) =14a(14) =1a(15) =0a(16) =28a(17) =155a(18) =147a(19) =29a(20) =1a(21) =0a(22) =56a(23) =605a(24) =1208a(25) =586a(26) =64a(27) =1a(28) =1a(29) =127

External references