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 | 1 |
| 3 | 2 |
| 4 | 8 |
| 5 | 34 |
| 6 | 149 |
| 7 | 672 |
| 8 | 3078 |
| 9 | 14232 |
| 10 | 66278 |
| 11 | 310408 |
| 12 | 1460390 |
| 13 | 6896417 |
| 14 | 32668860 |
| 15 | 155166468 |
| 16 | 738679240 |
| 17 | 3523549192 |
| 18 | 16837094932 |
| 19 | 80580576022 |
| 20 | 386187326865 |
| 21 | 1853144445292 |
| 22 | 8902504243912 |
| 23 | 42811658101548 |
| 24 | 206072505914938 |
| 25 | 992778384676916 |
| 26 | 4786621055083592 |