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 | 5 |
| 3 | 31 |
| 4 | 199 |
| 5 | 1637 |
| 6 | 8507 |
| 7 | 24110 |
| 8 | 95961 |
| 9 | 355541 |
| 10 | 1786062 |
| 11 | 6473791 |
| 12 | 30649362 |
| 13 | 109851909 |
| 14 | 456774199 |
| 15 | 2589994747 |
| 16 | 7613644886 |
| 17 | 37725066313 |
| 18 | 108500046711 |