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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 6 |
| 6 | 5 |
| 7 | 41 |
| 8 | 36 |
| 9 | 365 |
| 10 | 329 |
| 11 | 3984 |
| 12 | 3655 |
| 13 | 51499 |
| 14 | 47844 |
| 15 | 769159 |
| 16 | 721315 |
| 17 | 13031514 |
| 18 | 12310199 |
| 19 | 246925295 |
| 20 | 234615096 |
| 21 | 5173842311 |
| 22 | 4939227215 |
| 23 | 118776068256 |
| 24 | 113836841041 |
| 25 | 2964697094281 |
| 26 | 2850860253240 |
| 27 | 79937923931761 |
| 28 | 77087063678521 |
| 29 | 2315462770608870 |
| 30 | 2238375706930349 |