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 | 2 |
| 2 | 6 |
| 3 | 38 |
| 4 | 366 |
| 5 | 4502 |
| 6 | 66606 |
| 7 | 1149878 |
| 8 | 22687566 |
| 9 | 503589782 |
| 10 | 12420052206 |
| 11 | 336947795318 |
| 12 | 9972186170766 |
| 13 | 319727684645462 |
| 14 | 11039636939221806 |
| 15 | 408406422098722358 |
| 16 | 16116066766061589966 |
| 17 | 675700891505466507542 |