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) |
|---|---|
| 2 | 1 |
| 3 | 84 |
| 4 | 12870 |
| 5 | 3268760 |
| 6 | 1251677700 |
| 7 | 675248872536 |
| 8 | 488526937079580 |
| 9 | 456703981505085600 |
| 10 | 535983370403809682970 |
| 11 | 771629762387959506903300 |
| 12 | 1337261858854117218288723600 |
| 13 | 2746379593275133584459064976784 |
| 14 | 6596095888094645606758451183394760 |