Triangle read by rows: T(n,k) = number of heapable permutations of length n with exactly k 321 patterns.

A391971

Triangle read by rows: T(n,k) = number of heapable permutations of length n with exactly k 321 patterns.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =14a(6) =3a(7) =42a(8) =18a(9) =11a(10) =132a(11) =82a(12) =84a(13) =27a(14) =22a(15) =11a(16) =1a(17) =429a(18) =339a(19) =456a(20) =256a(21) =243a(22) =143a(23) =124a(24) =61a(25) =43a(26) =28a(27) =4a(28) =1430a(29) =1341

External references