Number of unoriented series-parallel networks with integer valued elements summing to n.

A339284

Number of unoriented series-parallel networks with integer valued elements summing to n.

Terms

    a(0) =1a(1) =3a(2) =7a(3) =23a(4) =73a(5) =281a(6) =1112a(7) =4779a(8) =21139a(9) =96793a(10) =451631a(11) =2144101a(12) =10303984a(13) =50042734a(14) =245110900a(15) =1209414659a(16) =6005130171a(17) =29983077169a(18) =150437143336a(19) =758110844897

External references