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 | 2 |
| 1 | 12 |
| 2 | 12 |
| 3 | 120 |
| 4 | 20 |
| 5 | 504 |
| 6 | 168 |
| 7 | 720 |
| 8 | 180 |
| 9 | 1320 |
| 10 | 88 |
| 11 | 65520 |
| 12 | 10920 |
| 13 | 5040 |
| 14 | 720 |
| 15 | 24480 |
| 16 | 68 |
| 17 | 28728 |
| 18 | 3192 |
| 19 | 39600 |
| 20 | 27720 |
| 21 | 182160 |
| 22 | 1840 |
| 23 | 1965600 |
| 24 | 163800 |
| 25 | 39312 |
| 26 | 3024 |
| 27 | 97440 |
| 28 | 2320 |
| 29 | 3437280 |
| 30 | 229152 |
| 31 | 3769920 |
| 32 | 235620 |
| 33 | 42840 |
| 34 | 280 |
| 35 | 138181680 |
| 36 | 219336 |
| 37 | 35568 |
| 38 | 1872 |
| 39 | 3247200 |