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 | 9 |
| 4 | 30 |
| 5 | 111 |
| 6 | 424 |
| 7 | 1705 |
| 8 | 7024 |
| 9 | 29692 |
| 10 | 127748 |
| 11 | 558219 |
| 12 | 2469403 |
| 13 | 11039992 |
| 14 | 49796803 |
| 15 | 226348740 |
| 16 | 1035750855 |
| 17 | 4767429667 |
| 18 | 22058219466 |
| 19 | 102534463563 |
| 20 | 478602668159 |
| 21 | 2242383155726 |
| 22 | 10541976883286 |
| 23 | 49714185649417 |
| 24 | 235109360767014 |
| 25 | 1114782699692044 |
| 26 | 5298494249055391 |