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 | 8 |
| 2 | 80 |
| 3 | 896 |
| 4 | 10752 |
| 5 | 135168 |
| 6 | 1757184 |
| 7 | 23429120 |
| 8 | 318636032 |
| 9 | 4402970624 |
| 10 | 61641588736 |
| 11 | 872465563648 |
| 12 | 12463793766400 |
| 13 | 179478630236160 |
| 14 | 2602440138424320 |
| 15 | 37965009078190080 |
| 16 | 556820133146787840 |
| 17 | 8205770383215820800 |
| 18 | 121445401671594147840 |
| 19 | 1804331681977970196480 |
| 20 | 26900945076762464747520 |