Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of length 2 (n>=0, k>=0).

A202841

Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of length 2 (n>=0, k>=0).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =7a(6) =1a(7) =14a(8) =3a(9) =31a(10) =6a(11) =66a(12) =16a(13) =142a(14) =43a(15) =316a(16) =104a(17) =3a(18) =708a(19) =256a(20) =14a(21) =1593a(22) =647a(23) =43a(24) =3625a(25) =1610a(26) =138a(27) =8314a(28) =3990a(29) =430

External references