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 | 4 |
| 3 | 1 |
| 4 | 28 |
| 5 | 12 |
| 6 | 1 |
| 7 | 280 |
| 8 | 112 |
| 9 | 48 |
| 10 | 24 |
| 11 | 1 |
| 12 | 3640 |
| 13 | 1400 |
| 14 | 1120 |
| 15 | 280 |
| 16 | 240 |
| 17 | 40 |
| 18 | 1 |
| 19 | 58240 |
| 20 | 21840 |
| 21 | 16800 |
| 22 | 7840 |
| 23 | 4200 |
| 24 | 6720 |
| 25 | 960 |
| 26 | 560 |
| 27 | 720 |
| 28 | 60 |
| 29 | 1 |
| 30 | 1106560 |
| 31 | 407680 |
| 32 | 305760 |
| 33 | 274400 |
| 34 | 76440 |
| 35 | 117600 |
| 36 | 54880 |
| 37 | 47040 |
| 38 | 9800 |
| 39 | 23520 |
| 40 | 6720 |
| 41 | 980 |
| 42 | 1680 |
| 43 | 84 |
| 44 | 1 |
| 45 | 24344320 |