The number of connected Feynman graphs in phi^4 theory with n vertices, 2 external legs.
A352174
The number of connected Feynman graphs in phi^4 theory with n vertices, 2 external legs.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =39a(5) =174a(6) =853a(7) =4632a(8) =27607a(9) =180148a(10) =1281437a(11) =9896652a(12) =82610706a(13) =742066238a(14) =7142537105a(15) =73372890090a(16) =801485878718
External references
- oeis: A352174