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 | 0 |
| 2 | 196560 |
| 3 | 16773120 |
| 4 | 398034000 |
| 5 | 4629381120 |
| 6 | 34417656000 |
| 7 | 187489935360 |
| 8 | 814879774800 |
| 9 | 2975551488000 |
| 10 | 9486551299680 |
| 11 | 27052945920000 |
| 12 | 70486236999360 |
| 13 | 169931095326720 |
| 14 | 384163586352000 |
| 15 | 820166620815360 |
| 16 | 1668890090322000 |