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 | 11 |
| 3 | 47 |
| 4 | 198 |
| 5 | 713 |
| 6 | 2423 |
| 7 | 7388 |
| 8 | 21003 |
| 9 | 55433 |
| 10 | 137944 |
| 11 | 324659 |
| 12 | 729022 |
| 13 | 1567139 |
| 14 | 3242954 |
| 15 | 6479759 |
| 16 | 12547894 |
| 17 | 23607614 |
| 18 | 43267994 |
| 19 | 77405064 |
| 20 | 135435666 |
| 21 | 232137202 |
| 22 | 390371944 |
| 23 | 644897542 |
| 24 | 1047890293 |
| 25 | 1676518363 |
| 26 | 2643628813 |