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 | 3 |
| 3 | 13 |
| 4 | 165 |
| 5 | 7901 |
| 6 | 1383853 |
| 7 | 879285501 |
| 8 | 2047199658621 |
| 9 | 17660268902020093 |
| 10 | 569790880105867285245 |
| 11 | 69280640454268889757533693 |