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 | 6 |
| 2 | 19 |
| 3 | 657 |
| 4 | 21691 |
| 5 | 489489 |
| 6 | 9902523 |
| 7 | 1144421889 |
| 8 | 1683200989470 |
| 9 | 349043376293530 |
| 10 | 137006962414679910 |
| 11 | 13293998056584952174157235 |