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 | 7 |
| 3 | 105 |
| 4 | 2386 |
| 5 | 71890 |
| 6 | 2695652 |
| 7 | 120907185 |
| 8 | 6312179764 |
| 9 | 375971507406 |
| 10 | 25160695768715 |
| 11 | 1869031937691061 |
| 12 | 152603843369288819 |
| 13 | 13584174777196666630 |
| 14 | 1309317592648179024666 |
| 15 | 135850890740575408906465 |