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 | 3 |
| 2 | 24 |
| 3 | 244 |
| 4 | 2802 |
| 5 | 34629 |
| 6 | 449509 |
| 7 | 6043716 |
| 8 | 83433402 |
| 9 | 1175735326 |
| 10 | 16843576440 |
| 11 | 244578817557 |
| 12 | 3591620791296 |
| 13 | 53247623771787 |
| 14 | 795901064582970 |
| 15 | 11981065741802125 |
| 16 | 181478799047422047 |
| 17 | 2763977213867989929 |
| 18 | 42301686984305340008 |