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 | 28 |
| 2 | 280 |
| 3 | 1680 |
| 4 | 7350 |
| 5 | 25872 |
| 6 | 77616 |
| 7 | 205920 |
| 8 | 495495 |
| 9 | 1101100 |
| 10 | 2290288 |
| 11 | 4504864 |
| 12 | 8446620 |
| 13 | 15193920 |
| 14 | 26356800 |
| 15 | 44279424 |
| 16 | 72299997 |
| 17 | 115079580 |
| 18 | 179012680 |
| 19 | 272734000 |
| 20 | 407737330 |
| 21 | 599124240 |
| 22 | 866502000 |
| 23 | 1235052000 |
| 24 | 1736791875 |
| 25 | 2412056556 |
| 26 | 3311225568 |
| 27 | 4496726080 |
| 28 | 6045343480 |