Number of oriented series-parallel networks with integer valued elements summing to n.
A339230
Number of oriented series-parallel networks with integer valued elements summing to n.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =32a(4) =120a(5) =490a(6) =2077a(7) =9158a(8) =41401a(9) =191232a(10) =897849a(11) =4273794a(12) =20573696a(13) =99994830a(14) =490000756a(15) =2418246995a(16) =12008813611a(17) =59962351145a(18) =300864703306
External references
- oeis: A339230