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 | 2 |
| 2 | 7 |
| 3 | 167 |
| 4 | 199 |
| 5 | 6271 |
| 6 | 12227 |
| 7 | 168713 |
| 8 | 579907 |
| 9 | 5937157 |
| 10 | 6829751 |
| 11 | 8059943 |
| 12 | 66858173 |
| 13 | 167857663 |
| 14 | 661416709 |
| 15 | 2322857987 |
| 16 | 12012698381 |
| 17 | 14641587607 |
| 18 | 26304771553 |
| 19 | 49671709081 |
| 20 | 1244930533403 |
| 21 | 1922085626009 |