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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 46 |
| 8 | 105 |
| 9 | 243 |
| 10 | 561 |
| 11 | 1301 |
| 12 | 3014 |
| 13 | 6995 |
| 14 | 16227 |
| 15 | 37668 |
| 16 | 87426 |
| 17 | 202961 |
| 18 | 471150 |
| 19 | 1093819 |
| 20 | 2539348 |
| 21 | 5895408 |
| 22 | 13686805 |
| 23 | 31775756 |
| 24 | 73771474 |
| 25 | 171270732 |
| 26 | 397628399 |
| 27 | 923150354 |
| 28 | 2143222823 |
| 29 | 4975795414 |
| 30 | 11552012449 |
| 31 | 26819637103 |
| 32 | 62265592589 |
| 33 | 144558421877 |