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 | 3 |
| 3 | 4 |
| 4 | 14 |
| 5 | 18 |
| 6 | 23 |
| 7 | 62 |
| 8 | 95 |
| 9 | 423 |
| 10 | 5339 |
| 11 | 12352 |
| 12 | 108359 |
| 13 | 129805 |
| 14 | 5334194 |
| 15 | 82007322 |
| 16 | 90401717 |
| 17 | 199671691 |
| 18 | 434184265 |
| 19 | 655956850 |
| 20 | 44438886071 |