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 | 2 |
| 1 | 1 |
| 2 | 6 |
| 3 | 36 |
| 4 | 322 |
| 5 | 3775 |
| 6 | 54758 |
| 7 | 946043 |
| 8 | 18957314 |
| 9 | 432083484 |
| 10 | 11035502502 |
| 11 | 312119004989 |
| 12 | 9682664443202 |
| 13 | 326872340718053 |
| 14 | 11928306344169798 |
| 15 | 467875943531657100 |
| 16 | 19629328849962024962 |
| 17 | 877095358067166709187 |
| 18 | 41583555684469161804998 |
| 19 | 2084882704791413248133431 |