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 | 1 |
| 2 | 2 |
| 3 | 15 |
| 4 | 944 |
| 5 | 725500 |
| 6 | 9319882896 |
| 7 | 2537598028922726 |
| 8 | 17768840869582166129408 |
| 9 | 3754397843576564028373337684409 |
| 10 | 27480138271604938576005130925123233245100 |