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 | 0 |
| 1 | -4 |
| 2 | -38 |
| 3 | -12 |
| 4 | 404 |
| 5 | 1900 |
| 6 | 5646 |
| 7 | 13412 |
| 8 | 27688 |
| 9 | 51804 |
| 10 | 90050 |
| 11 | 147796 |
| 12 | 231612 |
| 13 | 349388 |
| 14 | 510454 |
| 15 | 725700 |
| 16 | 1007696 |
| 17 | 1370812 |
| 18 | 1831338 |
| 19 | 2407604 |
| 20 | 3120100 |
| 21 | 3991596 |
| 22 | 5047262 |
| 23 | 6314788 |
| 24 | 7824504 |
| 25 | 9609500 |
| 26 | 11705746 |
| 27 | 14152212 |
| 28 | 16990988 |
| 29 | 20267404 |
| 30 | 24030150 |