Triangle T(n,k) read by rows: permutations on 123...n with one abc pattern and no aj pattern with j<=k, n>2, k<n-1.

A084249

Triangle T(n,k) read by rows: permutations on 123...n with one abc pattern and no aj pattern with j<=k, n>2, k<n-1.

Terms

    a(0) =1a(1) =6a(2) =2a(3) =27a(4) =12a(5) =3a(6) =110a(7) =55a(8) =19a(9) =4a(10) =429a(11) =229a(12) =91a(13) =27a(14) =5a(15) =1638a(16) =912a(17) =393a(18) =136a(19) =36a(20) =6a(21) =6188a(22) =3549a(23) =1614a(24) =612a(25) =191a(26) =46a(27) =7a(28) =23256a(29) =13636

External references