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 | 6 |
| 3 | 15 |
| 4 | 38 |
| 5 | 94 |
| 6 | 231 |
| 7 | 564 |
| 8 | 1372 |
| 9 | 3329 |
| 10 | 8064 |
| 11 | 19512 |
| 12 | 47177 |
| 13 | 114010 |
| 14 | 275430 |
| 15 | 665247 |
| 16 | 1606534 |
| 17 | 3879302 |
| 18 | 9366735 |
| 19 | 22615356 |
| 20 | 54601628 |
| 21 | 131825377 |
| 22 | 318263328 |
| 23 | 768369744 |
| 24 | 1855031473 |
| 25 | 4478479058 |
| 26 | 10812064614 |
| 27 | 26102729679 |
| 28 | 63017720390 |