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 | 2 |
| 2 | 4 |
| 3 | 16 |
| 4 | 25 |
| 5 | 89 |
| 6 | 91 |
| 7 | 105 |
| 8 | 127 |
| 9 | 290 |
| 10 | 668 |
| 11 | 869 |
| 12 | 16799 |
| 13 | 92694 |
| 14 | 137921 |
| 15 | 257825 |
| 16 | 350408 |
| 17 | 419427 |
| 18 | 723749 |
| 19 | 5271294 |
| 20 | 14223700 |
| 21 | 18090494 |
| 22 | 88123482 |
| 23 | 706641581 |