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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 20 |
| 7 | 40 |
| 8 | 120 |
| 9 | 288 |
| 10 | 864 |
| 11 | 1728 |
| 12 | 4800 |
| 13 | 9600 |
| 14 | 28800 |
| 15 | 84480 |
| 16 | 304128 |
| 17 | 608256 |
| 18 | 2322432 |
| 19 | 9289728 |
| 20 | 40642560 |
| 21 | 116121600 |
| 22 | 348364800 |
| 23 | 696729600 |
| 24 | 3185049600 |
| 25 | 8918138880 |
| 26 | 26754416640 |
| 27 | 149824733184 |
| 28 | 624269721600 |
| 29 | 1248539443200 |
| 30 | 6522981580800 |
| 31 | 26091926323200 |
| 32 | 107629196083200 |