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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 23 |
| 4 | 59 |
| 5 | 158 |
| 6 | 395 |
| 7 | 1023 |
| 8 | 2522 |
| 9 | 6414 |
| 10 | 15694 |
| 11 | 39486 |
| 12 | 96226 |
| 13 | 240470 |
| 14 | 584762 |
| 15 | 1454777 |
| 16 | 3533743 |
| 17 | 8763720 |
| 18 | 21276031 |
| 19 | 52642872 |
| 20 | 127770797 |
| 21 | 315574532 |
| 22 | 765852193 |
| 23 | 1888788990 |
| 24 | 4583560631 |
| 25 | 11290381790 |
| 26 | 27397549743 |
| 27 | 67414670138 |