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 | 108 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 900 |
| 5 | 2178 |
| 6 | -3672 |
| 7 | 0 |
| 8 | 14112 |
| 9 | 27000 |
| 10 | -18432 |
| 11 | -114444 |
| 12 | 290628 |
| 13 | 467856 |
| 14 | -354600 |
| 15 | -1479114 |
| 16 | 1768536 |
| 17 | 12073896 |
| 18 | -5861808 |
| 19 | -29193750 |
| 20 | 22900176 |
| 21 | 165214728 |
| 22 | 64153152 |
| 23 | -654007014 |
| 24 | 163350540 |
| 25 | 2795893038 |