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 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 30 |
| 6 | 100 |
| 7 | 376 |
| 8 | 1566 |
| 9 | 7094 |
| 10 | 34751 |
| 11 | 182841 |
| 12 | 1026167 |
| 13 | 6112799 |
| 14 | 38489481 |
| 15 | 255204077 |
| 16 | 1776046697 |
| 17 | 12936265145 |
| 18 | 98368170749 |
| 19 | 779127467795 |
| 20 | 6414876317675 |
| 21 | 54802126603135 |
| 22 | 484967246285755 |
| 23 | 4438877330941077 |
| 24 | 41963817964950737 |
| 25 | 409224941931240185 |