Number of nonequivalent series-parallel networks with n elements and without unit elements in parallel.

A339153

Number of nonequivalent series-parallel networks with n elements and without unit elements in parallel.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =6a(6) =10a(7) =20a(8) =37a(9) =74a(10) =144a(11) =295a(12) =594a(13) =1229a(14) =2540a(15) =5324a(16) =11177a(17) =23684a(18) =50326a(19) =107593a(20) =230743a(21) =497008a(22) =1073667a(23) =2327213a(24) =5057433a(25) =11020414a(26) =24068945a(27) =52685541a(28) =115555511a(29) =253933732

External references