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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 37 |
| 5 | 162 |
| 6 | 674 |
| 7 | 2871 |
| 8 | 12132 |
| 9 | 51436 |
| 10 | 217811 |
| 11 | 922780 |
| 12 | 3908764 |
| 13 | 16558101 |
| 14 | 70140734 |
| 15 | 297121734 |
| 16 | 1258626537 |
| 17 | 5331629710 |
| 18 | 22585142414 |
| 19 | 95672204155 |
| 20 | 405273951280 |
| 21 | 1716768021816 |
| 22 | 7272346018247 |
| 23 | 30806152127640 |
| 24 | 130496954475672 |
| 25 | 552793970116297 |
| 26 | 2341672834801754 |