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 | 6 |
| 3 | 16 |
| 4 | 40 |
| 5 | 99 |
| 6 | 247 |
| 7 | 625 |
| 8 | 1605 |
| 9 | 4178 |
| 10 | 11006 |
| 11 | 29292 |
| 12 | 78652 |
| 13 | 212812 |
| 14 | 579672 |
| 15 | 1588242 |
| 16 | 4374282 |
| 17 | 12103404 |
| 18 | 33628824 |
| 19 | 93786966 |
| 20 | 262450878 |
| 21 | 736710357 |
| 22 | 2073834417 |
| 23 | 5853011847 |
| 24 | 16558618507 |
| 25 | 46949351272 |
| 26 | 133390812252 |
| 27 | 379708642286 |
| 28 | 1082797114046 |
| 29 | 3092894319075 |
| 30 | 8848275403639 |