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 | 72 |
| 3 | 704 |
| 4 | 7264 |
| 5 | 77568 |
| 6 | 847104 |
| 7 | 9394176 |
| 8 | 105334272 |
| 9 | 1190899712 |
| 10 | 13551235072 |
| 11 | 154997784576 |
| 12 | 1780378353664 |
| 13 | 20522842062848 |
| 14 | 237284128063488 |
| 15 | 2750571189633024 |
| 16 | 31956067676454912 |
| 17 | 371997834879172608 |
| 18 | 4337957919010062336 |
| 19 | 50664706036388069376 |
| 20 | 592558533060795039744 |