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 | 20 |
| 3 | 10 |
| 4 | 1 |
| 5 | 1120 |
| 6 | 1040 |
| 7 | 290 |
| 8 | 30 |
| 9 | 1 |
| 10 | 123200 |
| 11 | 161920 |
| 12 | 71320 |
| 13 | 14040 |
| 14 | 1340 |
| 15 | 60 |
| 16 | 1 |
| 17 | 22422400 |
| 18 | 37452800 |
| 19 | 22097600 |
| 20 | 6263040 |
| 21 | 958720 |
| 22 | 82800 |
| 23 | 4000 |
| 24 | 100 |
| 25 | 1 |
| 26 | 6098892800 |
| 27 | 12222918400 |
| 28 | 8928102400 |
| 29 | 3257116800 |
| 30 | 675281600 |
| 31 | 84782880 |
| 32 | 6625920 |
| 33 | 322000 |