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 | 8 |
| 4 | 25 |
| 5 | 66 |
| 6 | 192 |
| 7 | 511 |
| 8 | 1418 |
| 9 | 3812 |
| 10 | 10383 |
| 11 | 27958 |
| 12 | 75758 |
| 13 | 204215 |
| 14 | 551821 |
| 15 | 1488561 |
| 16 | 4018722 |
| 17 | 10842422 |
| 18 | 29262357 |
| 19 | 78955472 |
| 20 | 213063551 |
| 21 | 574905487 |
| 22 | 1551325859 |
| 23 | 4185959285 |
| 24 | 11295211039 |
| 25 | 30478118079 |
| 26 | 82240300045 |
| 27 | 221911189754 |
| 28 | 598790247900 |
| 29 | 1615732588962 |