Triangle read by rows: T(n,k) is the number of secondary structures of size n with no stacks of length >=2 and having k stacks of length 1 (n>=0, k>=0).
A202851
Triangle read by rows: T(n,k) is the number of secondary structures of size n with no stacks of length >=2 and having k stacks of length 1 (n>=0, k>=0).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =1a(8) =6a(9) =1a(10) =10a(11) =3a(12) =1a(13) =15a(14) =14a(15) =1a(16) =21a(17) =40a(18) =1a(19) =1a(20) =28a(21) =90a(22) =16a(23) =1a(24) =36a(25) =175a(26) =85a(27) =1a(28) =45a(29) =308
External references
- oeis: A202851