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

A339292

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

Terms

    a(0) =1a(1) =0a(2) =1a(3) =2a(4) =3a(5) =6a(6) =11a(7) =21a(8) =41a(9) =79a(10) =154a(11) =304a(12) =598a(13) =1188a(14) =2360a(15) =4719a(16) =9431a(17) =18966a(18) =38107a(19) =76968a(20) =155368a(21) =314987a(22) =638325a(23) =1298379a(24) =2640223a(25) =5385737a(26) =10984999a(27) =22465570a(28) =45945256a(29) =94180208

External references