Triangle read by rows: T(n,k) is the number of ternary words of length n with k strictly increasing runs (0 <= k <= n; for example, the ternary word 2|01|12|02|1|1|012|2 has 8 strictly increasing runs).

A120987

Triangle read by rows: T(n,k) is the number of ternary words of length n with k strictly increasing runs (0 <= k <= n; for example, the ternary word 2|01|12|02|1|1|012|2 has 8 strictly increasing runs).

Terms

    a(0) =1a(1) =0a(2) =3a(3) =0a(4) =3a(5) =6a(6) =0a(7) =1a(8) =16a(9) =10a(10) =0a(11) =0a(12) =15a(13) =51a(14) =15a(15) =0a(16) =0a(17) =6a(18) =90a(19) =126a(20) =21a(21) =0a(22) =0a(23) =1a(24) =77a(25) =357a(26) =266a(27) =28a(28) =0a(29) =0

External references