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 | 7 |
| 3 | 16 |
| 4 | 40 |
| 5 | 99 |
| 6 | 249 |
| 7 | 622 |
| 8 | 1559 |
| 9 | 3907 |
| 10 | 9793 |
| 11 | 24547 |
| 12 | 61529 |
| 13 | 154231 |
| 14 | 386598 |
| 15 | 969057 |
| 16 | 2429064 |
| 17 | 6088761 |
| 18 | 15262259 |
| 19 | 38256810 |
| 20 | 95895601 |
| 21 | 240374624 |
| 22 | 602529829 |
| 23 | 1510318306 |
| 24 | 3785806568 |
| 25 | 9489609785 |
| 26 | 23786924201 |
| 27 | 59624976769 |
| 28 | 149457652642 |
| 29 | 374634777973 |