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 | 1 |
| 2 | 56448 |
| 3 | 127008 |
| 4 | 259200 |
| 5 | 5644800 |
| 6 | 31840200 |
| 7 | 42688800 |
| 8 | 60766200 |
| 9 | 116493300 |
| 10 | 130662720 |
| 11 | 193179168 |
| 12 | 442828800 |
| 13 | 499000500 |
| 14 | 897544800 |
| 15 | 917632800 |
| 16 | 3624409800 |
| 17 | 6914880000 |
| 18 | 13831171200 |
| 19 | 15410656800 |
| 20 | 31246000128 |
| 21 | 53936416800 |
| 22 | 64024732800 |
| 23 | 72945774720 |
| 24 | 88957620000 |