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 | 0 |
| 1 | 1 |
| 2 | 20 |
| 3 | 243 |
| 4 | 2800 |
| 5 | 33425 |
| 6 | 424116 |
| 7 | 5762155 |
| 8 | 83891648 |
| 9 | 1306561185 |
| 10 | 21709011700 |
| 11 | 383654149571 |
| 12 | 7189789929840 |
| 13 | 142465285362673 |
| 14 | 2976697773182420 |
| 15 | 65417312929686075 |
| 16 | 1508567496105346816 |
| 17 | 36425941390897897025 |
| 18 | 919100609186531702868 |