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 | 90 |
| 2 | 5040 |
| 3 | 226800 |
| 4 | 9008496 |
| 5 | 330674400 |
| 6 | 11511434880 |
| 7 | 386143718400 |
| 8 | 12611398415616 |
| 9 | 403864019919360 |
| 10 | 12744269679697920 |
| 11 | 397694704355020800 |
| 12 | 12304809943691636736 |
| 13 | 378212825199337758720 |
| 14 | 11565710925825703772160 |