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 | 15 |
| 3 | 54 |
| 4 | 185 |
| 5 | 853 |
| 6 | 3569 |
| 7 | 14691 |
| 8 | 62193 |
| 9 | 261763 |
| 10 | 1099727 |
| 11 | 4630135 |
| 12 | 19487541 |
| 13 | 82011553 |
| 14 | 345200748 |
| 15 | 1452975794 |
| 16 | 6115623192 |
| 17 | 25741334468 |
| 18 | 108348131766 |
| 19 | 456048653285 |
| 20 | 1919560023966 |
| 21 | 8079646389293 |
| 22 | 34008145665113 |
| 23 | 143144156221751 |