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) |
|---|---|
| 1 | 0 |
| 2 | 420 |
| 3 | 4952 |
| 4 | 91048 |
| 5 | 1053432 |
| 6 | 14382480 |
| 7 | 164351184 |
| 8 | 2008761644 |
| 9 | 22653710120 |
| 10 | 262438771480 |
| 11 | 2922424553104 |
| 12 | 32858512559296 |
| 13 | 361841100434016 |
| 14 | 3993863461953940 |
| 15 | 43568235211010040 |
| 16 | 474957563309125640 |