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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 7 |
| 5 | 19 |
| 6 | 26 |
| 7 | 123 |
| 8 | 395 |
| 9 | 5258 |
| 10 | 26685 |
| 11 | 31943 |
| 12 | 58628 |
| 13 | 500967 |
| 14 | 559595 |
| 15 | 1620157 |
| 16 | 7040223 |
| 17 | 8660380 |
| 18 | 15700603 |
| 19 | 636684500 |
| 20 | 652385103 |
| 21 | 7812920633 |
| 22 | 24091147002 |
| 23 | 176450949647 |
| 24 | 200542096649 |
| 25 | 1580245626190 |
| 26 | 1780787722839 |
| 27 | 3361033349029 |