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 | -9 |
| 2 | 36 |
| 3 | -90 |
| 4 | 180 |
| 5 | -351 |
| 6 | 684 |
| 7 | -1260 |
| 8 | 2196 |
| 9 | -3735 |
| 10 | 6264 |
| 11 | -10260 |
| 12 | 16380 |
| 13 | -25749 |
| 14 | 40032 |
| 15 | -61344 |
| 16 | 92628 |
| 17 | -138348 |
| 18 | 204804 |
| 19 | -300204 |
| 20 | 435672 |
| 21 | -627147 |
| 22 | 896400 |
| 23 | -1271808 |
| 24 | 1791324 |
| 25 | -2507013 |
| 26 | 3488472 |
| 27 | -4826070 |
| 28 | 6638688 |
| 29 | -9085176 |
| 30 | 12373992 |
| 31 | -16773876 |
| 32 | 22633812 |