The number of Feynman graphs in phi^4 theory with n vertices, 2 external legs.
A352173
The number of Feynman graphs in phi^4 theory with n vertices, 2 external legs.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =23a(4) =85a(5) =340a(6) =1517a(7) =7489a(8) =41276a(9) =252410a(10) =1706071a(11) =12660012a(12) =102447112a(13) =898081422a(14) =8477941776a(15) =85729296020a(16) =924345402273
External references
- oeis: A352173