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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 37 |
| 4 | 365 |
| 5 | 4501 |
| 6 | 66605 |
| 7 | 1149877 |
| 8 | 22687565 |
| 9 | 503589781 |
| 10 | 12420052205 |
| 11 | 336947795317 |
| 12 | 9972186170765 |
| 13 | 319727684645461 |
| 14 | 11039636939221805 |
| 15 | 408406422098722357 |
| 16 | 16116066766061589965 |
| 17 | 675700891505466507541 |