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 | 2 |
| 2 | 3 |
| 3 | 1 |
| 4 | 5 |
| 5 | 4 |
| 6 | 6 |
| 7 | 21 |
| 8 | 77 |
| 9 | 13 |
| 10 | 18759792910 |
| 11 | 51104148 |
| 12 | 226096622 |
| 13 | 285439624304460249957765 |
| 14 | 9476683358538538610273746404006394881428593545 |