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 | 23 |
| 2 | 216 |
| 3 | 1684 |
| 4 | 11932 |
| 5 | 79739 |
| 6 | 512681 |
| 7 | 3216277 |
| 8 | 19817136 |
| 9 | 120478844 |
| 10 | 724707450 |
| 11 | 4322688971 |
| 12 | 25608764387 |
| 13 | 150879112600 |
| 14 | 884928308606 |
| 15 | 5170909446013 |
| 16 | 30121160018287 |
| 17 | 174998088275471 |
| 18 | 1014425257507861 |
| 19 | 5869059549460367 |