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 | 2 |
| 2 | 36 |
| 3 | 488 |
| 4 | 5904 |
| 5 | 67232 |
| 6 | 737856 |
| 7 | 7902848 |
| 8 | 83222784 |
| 9 | 865782272 |
| 10 | 8926258176 |
| 11 | 91410065408 |
| 12 | 931280523264 |
| 13 | 9450244186112 |
| 14 | 95601953488896 |
| 15 | 964815627911168 |
| 16 | 9718525023289344 |
| 17 | 97748200186314752 |
| 18 | 981985601490518016 |
| 19 | 9855884811924144128 |