Feynman Diagrams for Quantum Electrodynamics First order Second order Third order Fourth order Number of diagrams is 2, 10, 74, 706 (as shown above), 8162, 110410, 1708394, 29752066 ... (Sequence A000698 in The On-Line Encyclopedia of Integer Sequences) “The theory of quantum electrodynamics describes Nature as absurd from the point of view of common sense. And it agrees fully with experiment. So I hope you accept Nature as She is — absurd.” - Richard Feynman. Poster by timday@timday.com This work is licensed under a Creative Commons “Attribution-NonCommercial-ShareAlike 4.0 International” license.