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 | 12 |
| 3 | 38 |
| 4 | 117 |
| 5 | 330 |
| 6 | 906 |
| 7 | 2367 |
| 8 | 6027 |
| 9 | 14873 |
| 10 | 35892 |
| 11 | 84657 |
| 12 | 196018 |
| 13 | 445746 |
| 14 | 997962 |
| 15 | 2201438 |
| 16 | 4792005 |
| 17 | 10300950 |
| 18 | 21889368 |
| 19 | 46012119 |
| 20 | 95746284 |
| 21 | 197344937 |
| 22 | 403121547 |
| 23 | 816501180 |
| 24 | 1640549317 |
| 25 | 3271188702 |
| 26 | 6475456896 |
| 27 | 12730032791 |
| 28 | 24861111315 |
| 29 | 48246729411 |
| 30 | 93065426256 |