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 | 12 |
| 4 | 31 |
| 5 | 82 |
| 6 | 223 |
| 7 | 616 |
| 8 | 1723 |
| 9 | 4862 |
| 10 | 13815 |
| 11 | 39468 |
| 12 | 113257 |
| 13 | 326198 |
| 14 | 942425 |
| 15 | 2730032 |
| 16 | 7926659 |
| 17 | 23061590 |
| 18 | 67214399 |
| 19 | 196211252 |
| 20 | 573590621 |
| 21 | 1678941350 |
| 22 | 4920076877 |
| 23 | 14433305000 |
| 24 | 42381641381 |
| 25 | 124558477682 |
| 26 | 366371703833 |