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) |
|---|---|
| 1 | 3 |
| 2 | 35 |
| 3 | 920 |
| 4 | 137961 |
| 5 | 96014413 |
| 6 | 374409597564 |
| 7 | 7673178325424236 |
| 8 | 823755531731133088630 |
| 9 | 468550736330699430524865279 |