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 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 36 |
| 5 | 92 |
| 6 | 234 |
| 7 | 586 |
| 8 | 1452 |
| 9 | 3562 |
| 10 | 8674 |
| 11 | 20956 |
| 12 | 50290 |
| 13 | 119922 |
| 14 | 284308 |
| 15 | 670458 |
| 16 | 1573250 |
| 17 | 3674700 |
| 18 | 8546282 |
| 19 | 19796234 |
| 20 | 45681908 |
| 21 | 105041402 |
| 22 | 240723618 |
| 23 | 549919604 |
| 24 | 1252492674 |
| 25 | 2844551866 |
| 26 | 6442833156 |
| 27 | 14555300218 |
| 28 | 32801922154 |
| 29 | 73749649900 |
| 30 | 165443000338 |