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 | 1 |
| 2 | 8 |
| 3 | 32 |
| 4 | 280 |
| 5 | 1728 |
| 6 | 16744 |
| 7 | 117856 |
| 8 | 1202552 |
| 9 | 9044352 |
| 10 | 95203784 |
| 11 | 745451168 |
| 12 | 8011827928 |
| 13 | 64459117632 |
| 14 | 703166465320 |
| 15 | 5769038826208 |
| 16 | 63639465830712 |
| 17 | 529889242505984 |
| 18 | 5896324892061576 |
| 19 | 49665617425122592 |
| 20 | 556508207889107096 |