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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 276 |
| 4 | -1748 |
| 5 | 4854 |
| 6 | 0 |
| 7 | -16720 |
| 8 | 44552 |
| 9 | -107295 |
| 10 | 0 |
| 11 | 534636 |
| 12 | -482448 |
| 13 | -577714 |
| 14 | 0 |
| 15 | 1339704 |
| 16 | 2528206 |
| 17 | -6905910 |
| 18 | 0 |
| 19 | 10661444 |
| 20 | -8484792 |
| 21 | -4614720 |
| 22 | 0 |
| 23 | 18643296 |
| 24 | 12296352 |
| 25 | -25383005 |
| 26 | 0 |
| 27 | -75928312 |
| 28 | 29226560 |
| 29 | 128406654 |
| 30 | 0 |
| 31 | -52843144 |
| 32 | -151821160 |
| 33 | 147559536 |
| 34 | 0 |
| 35 | -81158880 |