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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 48 |
| 8 | 115 |
| 9 | 286 |
| 10 | 718 |
| 11 | 1839 |
| 12 | 4757 |
| 13 | 12460 |
| 14 | 32897 |
| 15 | 87592 |
| 16 | 234746 |
| 17 | 633013 |
| 18 | 1715851 |
| 19 | 4673320 |
| 20 | 12781759 |
| 21 | 35093010 |
| 22 | 96681705 |
| 23 | 267199518 |
| 24 | 740580555 |
| 25 | 2058042803 |
| 26 | 5733101603 |
| 27 | 16006590851 |
| 28 | 44782679547 |
| 29 | 125533577578 |
| 30 | 352525803976 |
| 31 | 991634575368 |