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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.

A115974 Number of Feynman diagrams (vanishing and non-vanishing) of order 2n for the proper self-energy function of quantum electrodynamics (QED).

Table of values

n a(n)
0 1
1 2
2 6
3 42
4 414
5 5058
6 72486
7 1182762
8 21573054
9 434358018
10 9565348806
11 228740050602
12 5904853053534
13 163728751178178
14 4855046674314726
15 153367360732387242
16 5143219420761900414
17 182530741698302811138
18 6835913695777897799046
19 269455018264860747728682
20 11152465473005099074500894
21 483617145128737549802831298

List of values

[1, 2, 6, 42, 414, 5058, 72486, 1182762, 21573054, 434358018, 9565348806, 228740050602, 5904853053534, 163728751178178, 4855046674314726, 153367360732387242, 5143219420761900414, 182530741698302811138, 6835913695777897799046, 269455018264860747728682, 11152465473005099074500894, 483617145128737549802831298]

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

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