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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 6 |
| 6 | 9 |
| 7 | 16 |
| 8 | 31 |
| 9 | 69 |
| 10 | 168 |
| 11 | 447 |
| 12 | 1274 |
| 13 | 3862 |
| 14 | 12351 |
| 15 | 41472 |
| 16 | 145661 |
| 17 | 533745 |
| 18 | 2036158 |
| 19 | 8071795 |
| 20 | 33192800 |
| 21 | 141351726 |
| 22 | 622384741 |
| 23 | 2829417288 |
| 24 | 13263528363 |
| 25 | 64038928741 |
| 26 | 318121600708 |
| 27 | 1624347614751 |
| 28 | 8517247764150 |
| 29 | 45822087138894 |