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 | 32 |
| 2 | -32 |
| 3 | -3712 |
| 4 | 33248 |
| 5 | -154176 |
| 6 | 519808 |
| 7 | -1515776 |
| 8 | 3961312 |
| 9 | -9076576 |
| 10 | 18733632 |
| 11 | -36644736 |
| 12 | 68028032 |
| 13 | -118068032 |
| 14 | 196600064 |
| 15 | -321854208 |
| 16 | 509407712 |
| 17 | -771903936 |
| 18 | 1144487776 |
| 19 | -1683935360 |
| 20 | 2427663936 |
| 21 | -3391425536 |
| 22 | 4658284416 |
| 23 | -6406755072 |