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 | 5 |
| 5 | 14 |
| 6 | 43 |
| 7 | 140 |
| 8 | 477 |
| 9 | 1683 |
| 10 | 6106 |
| 11 | 22664 |
| 12 | 85735 |
| 13 | 329572 |
| 14 | 1284440 |
| 15 | 5065828 |
| 16 | 20188877 |
| 17 | 81201801 |
| 18 | 329281059 |
| 19 | 1345059602 |
| 20 | 5530600618 |
| 21 | 22876354484 |
| 22 | 95137126194 |
| 23 | 397610249052 |
| 24 | 1669285639455 |
| 25 | 7037395810149 |
| 26 | 29782584966376 |