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 | 2 |
| 3 | 7 |
| 4 | 24 |
| 5 | 96 |
| 6 | 418 |
| 7 | 1989 |
| 8 | 10216 |
| 9 | 56275 |
| 10 | 330424 |
| 11 | 2057672 |
| 12 | 13532060 |
| 13 | 93633021 |
| 14 | 679473694 |
| 15 | 5156626991 |
| 16 | 40824399712 |
| 17 | 336406367196 |
| 18 | 2879570703510 |
| 19 | 25557841113625 |
| 20 | 234822774979908 |
| 21 | 2230107923204443 |
| 22 | 21861817965483016 |
| 23 | 220940261740238140 |
| 24 | 2299258336094622008 |