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 | 3 |
| 2 | 21 |
| 3 | 168 |
| 4 | 280 |
| 5 | 210 |
| 6 | 1365 |
| 7 | 42315 |
| 8 | 8463 |
| 9 | 45136 |
| 10 | 406224 |
| 11 | 253890 |
| 12 | 310310 |
| 13 | 744744 |
| 14 | 744744 |
| 15 | 94582488 |
| 16 | 661416 |
| 17 | 110236 |
| 18 | 21496020 |
| 19 | 924328860 |
| 20 | 7394630880 |
| 21 | 894750336480 |
| 22 | 5070251906720 |
| 23 | 5704033395060 |
| 24 | 6375096147420 |
| 25 | 6375096147420 |
| 26 | 2550038458968 |
| 27 | 2550038458968 |