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) |
|---|---|
| 0 | 1 |
| 1 | 42 |
| 2 | 1722 |
| 3 | 70602 |
| 4 | 2893821 |
| 5 | 118611360 |
| 6 | 4861619280 |
| 7 | 199267084800 |
| 8 | 8167519684380 |
| 9 | 334768674223200 |
| 10 | 13721431911885600 |
| 11 | 562411325222191200 |
| 12 | 23052003666190808400 |
| 13 | 944850946620132384000 |
| 14 | 38727362890294069152000 |