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 | 65 |
| 3 | 609 |
| 4 | 3808 |
| 5 | 35476 |
| 6 | 340825 |
| 7 | 2997197 |
| 8 | 26513027 |
| 9 | 237701708 |
| 10 | 2127406714 |
| 11 | 19008671433 |
| 12 | 169867295652 |
| 13 | 1518292533694 |
| 14 | 13571135299252 |
| 15 | 121300487637606 |
| 16 | 1084181857884980 |
| 17 | 9690470338269840 |
| 18 | 86614217136138558 |
| 19 | 774163716085023913 |