Triangle read by rows where T(n,k) is the number of patterns of length n with k runs.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =2a(6) =0a(7) =1a(8) =4a(9) =8a(10) =0a(11) =1a(12) =6a(13) =24a(14) =44a(15) =0a(16) =1a(17) =8a(18) =48a(19) =176a(20) =308a(21) =0a(22) =1a(23) =10a(24) =80a(25) =440a(26) =1540a(27) =2612a(28) =0a(29) =1