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 | 496 |
| 2 | 69752 |
| 3 | 2115008 |
| 4 | 34670620 |
| 5 | 394460000 |
| 6 | 3499148224 |
| 7 | 25817318016 |
| 8 | 165011628166 |
| 9 | 939112182480 |
| 10 | 4853601292512 |
| 11 | 23116070653888 |
| 12 | 102602164703800 |
| 13 | 428200065370144 |
| 14 | 1692346392263680 |
| 15 | 6371305129660032 |