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 | 3 |
| 3 | 10 |
| 4 | 27 |
| 5 | 74 |
| 6 | 201 |
| 7 | 548 |
| 8 | 1490 |
| 9 | 4051 |
| 10 | 11013 |
| 11 | 29937 |
| 12 | 81377 |
| 13 | 221206 |
| 14 | 601302 |
| 15 | 1634508 |
| 16 | 4443055 |
| 17 | 12077476 |
| 18 | 32829984 |
| 19 | 89241150 |
| 20 | 242582597 |
| 21 | 659407867 |
| 22 | 1792456423 |
| 23 | 4872401723 |
| 24 | 13244561064 |
| 25 | 36002449668 |
| 26 | 97864804714 |
| 27 | 266024120300 |
| 28 | 723128532145 |
| 29 | 1965667148572 |