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 | 209 |
| 3 | 30305 |
| 4 | 4140081 |
| 5 | 557568000 |
| 6 | 74795194705 |
| 7 | 10021992194369 |
| 8 | 1342421467113969 |
| 9 | 179796299139278305 |
| 10 | 24080189412483072000 |
| 11 | 3225041354570508955681 |
| 12 | 431926215138756947267505 |
| 13 | 57847355494807961811035009 |
| 14 | 7747424602888405489208931601 |