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 | 12 |
| 2 | 144 |
| 3 | 1103 |
| 4 | 7868 |
| 5 | 60215 |
| 6 | 471349 |
| 7 | 3658041 |
| 8 | 28240356 |
| 9 | 218167554 |
| 10 | 1687182731 |
| 11 | 13048449716 |
| 12 | 100897161709 |
| 13 | 780153946407 |
| 14 | 6032429478257 |
| 15 | 46645504480302 |
| 16 | 360683651186398 |
| 17 | 2788957182000107 |
| 18 | 21565381169985048 |
| 19 | 166752620658425497 |