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 | 120 |
| 2 | 3552 |
| 3 | 57064 |
| 4 | 681984 |
| 5 | 6849792 |
| 6 | 61486080 |
| 7 | 511006848 |
| 8 | 4019699712 |
| 9 | 30364991488 |
| 10 | 222472642560 |
| 11 | 1592011745280 |
| 12 | 11183547482112 |
| 13 | 77409364082688 |
| 14 | 529414815744000 |
| 15 | 3585105638490112 |
| 16 | 24077527815290880 |
| 17 | 160571745918517248 |
| 18 | 1064387288330403840 |
| 19 | 7018456956044574720 |