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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 0 |
| 5 | 1 |
| 6 | 12 |
| 7 | 12 |
| 8 | 6 |
| 9 | 2 |
| 10 | 300 |
| 11 | 336 |
| 12 | 168 |
| 13 | 48 |
| 14 | 6 |
| 15 | 13680 |
| 16 | 15120 |
| 17 | 7560 |
| 18 | 2160 |
| 19 | 360 |
| 20 | 24 |
| 21 | 920400 |
| 22 | 1000800 |
| 23 | 498960 |
| 24 | 146880 |
| 25 | 27000 |
| 26 | 2880 |
| 27 | 120 |
| 28 | 85004640 |
| 29 | 91314720 |
| 30 | 45516240 |
| 31 | 13698720 |
| 32 | 2691360 |
| 33 | 342720 |
| 34 | 25200 |
| 35 | 720 |
| 36 | 10314511200 |
| 37 | 10981474560 |
| 38 | 5476625280 |
| 39 | 1675699200 |
| 40 | 344433600 |
| 41 | 48545280 |
| 42 | 4515840 |
| 43 | 241920 |
| 44 | 5040 |