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.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 36 |
| 4 | 723 |
| 5 | 20280 |
| 6 | 730755 |
| 7 | 32171580 |
| 8 | 1673573895 |
| 9 | 100442870640 |
| 10 | 6831585584775 |
| 11 | 519288366989700 |
| 12 | 43626178967384475 |
| 13 | 4014060030471090600 |
| 14 | 401443860155706643275 |
| 15 | 43359414126089609047500 |
| 16 | 5030039291029886037279375 |
| 17 | 623762332206315636458124000 |
| 18 | 82340968923184527676400655375 |
| 19 | 11528273478697179256689693556500 |