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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 6 |
| 5 | 79 |
| 6 | 1499 |
| 7 | 35317 |
| 8 | 967255 |
| 9 | 29949217 |
| 10 | 1033242585 |
| 11 | 39323062014 |
| 12 | 1637375262965 |
| 13 | 74075329383599 |
| 14 | 3619112881630497 |
| 15 | 189953824713590782 |
| 16 | 10661151595417930874 |
| 17 | 637230479685691806302 |
| 18 | 40415532825383300892418 |
| 19 | 2711124591869919503655096 |