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 | 76 |
| 3 | 5777 |
| 4 | 439128 |
| 5 | 33379505 |
| 6 | 2537281508 |
| 7 | 192866774113 |
| 8 | 14660412114096 |
| 9 | 1114384187445409 |
| 10 | 84707858657965180 |
| 11 | 6438911642192799089 |
| 12 | 489441992665310695944 |
| 13 | 37204030354205805690833 |