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

A339152

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

Terms

    a(0) =1a(1) =0a(2) =0a(3) =1a(4) =1a(5) =3a(6) =4a(7) =9a(8) =16a(9) =33a(10) =63a(11) =131a(12) =261a(13) =545a(14) =1123a(15) =2359a(16) =4948a(17) =10502a(18) =22307a(19) =47731a(20) =102367a(21) =220600a(22) =476626a(23) =1033450a(24) =2246252a(25) =4895935a(26) =10694744a(27) =23414838a(28) =51364180a(29) =112891831

External references