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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A005411 Number of non-vanishing Feynman diagrams of order 2n for the electron or the photon propagators in quantum electrodynamics.

Table of values

n a(n)
0 1
1 1
2 4
3 25
4 208
5 2146
6 26368
7 375733
8 6092032
9 110769550
10 2232792064
11 49426061818
12 1192151302144
13 31123028996164
14 874428204384256
15 26308967412122125
16 843984969276915712
17 28757604639850111894
18 1037239628039528906752
19 39481325230750749160462

List of values

[1, 1, 4, 25, 208, 2146, 26368, 375733, 6092032, 110769550, 2232792064, 49426061818, 1192151302144, 31123028996164, 874428204384256, 26308967412122125, 843984969276915712, 28757604639850111894, 1037239628039528906752, 39481325230750749160462]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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