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 | 13 |
| 3 | 286 |
| 4 | 8866 |
| 5 | 354640 |
| 6 | 17377360 |
| 7 | 1007886880 |
| 8 | 67528420960 |
| 9 | 5132159992960 |
| 10 | 436233599401600 |
| 11 | 41005958343750400 |
| 12 | 4223613709406291200 |
| 13 | 473044735453504614400 |
| 14 | 57238412989874058342400 |
| 15 | 7440993688683627584512000 |
| 16 | 1034298122727024234247168000 |
| 17 | 153076122163599586668580864000 |