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) |
|---|---|
| 7 | 1 |
| 8 | 56 |
| 9 | 2052 |
| 10 | 63000 |
| 11 | 1777050 |
| 12 | 48149640 |
| 13 | 1284709140 |
| 14 | 34260506280 |
| 15 | 921799753875 |
| 16 | 25175488338000 |
| 17 | 700755564108600 |
| 18 | 19932553764723600 |
| 19 | 580406741946731700 |
| 20 | 17320767850295910000 |
| 21 | 530112107596146075000 |
| 22 | 16645556950225160958000 |