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 | 3 |
| 3 | 8 |
| 4 | 15 |
| 5 | 64 |
| 6 | 65 |
| 7 | 426 |
| 8 | 847 |
| 9 | 2528 |
| 10 | 2529 |
| 11 | 27730 |
| 12 | 27731 |
| 13 | 360372 |
| 14 | 360373 |
| 15 | 360374 |
| 16 | 720735 |
| 17 | 12252256 |
| 18 | 12252257 |
| 19 | 232792578 |
| 20 | 232792579 |
| 21 | 232792580 |
| 22 | 232792581 |
| 23 | 5354228902 |
| 24 | 5354228903 |
| 25 | 26771144424 |
| 26 | 26771144425 |
| 27 | 80313433226 |