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 | 7 |
| 4 | 26 |
| 5 | 102 |
| 6 | 424 |
| 7 | 1827 |
| 8 | 8078 |
| 9 | 36466 |
| 10 | 167376 |
| 11 | 778718 |
| 12 | 3664164 |
| 13 | 17407068 |
| 14 | 83375616 |
| 15 | 402198915 |
| 16 | 1952296598 |
| 17 | 9528757098 |
| 18 | 46735576816 |
| 19 | 230227356906 |
| 20 | 1138609205372 |
| 21 | 5651170500612 |
| 22 | 28138939936704 |
| 23 | 140527262919342 |
| 24 | 703704207921932 |
| 25 | 3532664478314484 |
| 26 | 17775185122527776 |