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 | 7 |
| 3 | 28 |
| 4 | 105 |
| 5 | 357 |
| 6 | 1232 |
| 7 | 4067 |
| 8 | 13301 |
| 9 | 42357 |
| 10 | 132845 |
| 11 | 409262 |
| 12 | 1243767 |
| 13 | 3727360 |
| 14 | 11036649 |
| 15 | 32300795 |
| 16 | 93538278 |
| 17 | 268164868 |
| 18 | 761656685 |
| 19 | 2144259516 |
| 20 | 5986658951 |
| 21 | 16583102077 |
| 22 | 45593269265 |
| 23 | 124464561544 |
| 24 | 337479729179 |
| 25 | 909156910290 |
| 26 | 2434121462871 |
| 27 | 6478440788169 |