Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of length 3.
A202843
Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of length 3.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =8a(6) =17a(7) =36a(8) =1a(9) =79a(10) =3a(11) =179a(12) =6a(13) =407a(14) =16a(15) =935a(16) =43a(17) =2173a(18) =110a(19) =5089a(20) =284a(21) =12005a(22) =727a(23) =3a(24) =28500a(25) =1858a(26) =14a(27) =68022a(28) =4767a(29) =43
External references
- oeis: A202843