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 | 4 |
| 2 | 12 |
| 3 | 60 |
| 4 | 296 |
| 5 | 1338 |
| 6 | 5648 |
| 7 | 21842 |
| 8 | 77559 |
| 9 | 249690 |
| 10 | 717788 |
| 11 | 1834379 |
| 12 | 4138302 |
| 13 | 8171208 |
| 14 | 14020166 |
| 15 | 20773236 |
| 16 | 26482824 |
| 17 | 28994876 |
| 18 | 27286330 |
| 19 | 22106348 |
| 20 | 15425572 |
| 21 | 9274496 |
| 22 | 4792664 |
| 23 | 2120101 |
| 24 | 800152 |
| 25 | 255544 |
| 26 | 68236 |
| 27 | 14727 |
| 28 | 2529 |
| 29 | 334 |
| 30 | 32 |
| 31 | 5 |