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 | 10 |
| 2 | 130 |
| 3 | 2080 |
| 4 | 39520 |
| 5 | 869440 |
| 6 | 21736000 |
| 7 | 608608000 |
| 8 | 18866848000 |
| 9 | 641472832000 |
| 10 | 23734494784000 |
| 11 | 949379791360000 |
| 12 | 40823331028480000 |
| 13 | 1877873227310080000 |
| 14 | 92015788138193920000 |
| 15 | 4784820983186083840000 |
| 16 | 263165154075234611200000 |
| 17 | 15263578936363607449600000 |