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 | 4 |
| 2 | 14 |
| 3 | 40 |
| 4 | 76 |
| 5 | -16 |
| 6 | -824 |
| 7 | -3104 |
| 8 | -880 |
| 9 | 46144 |
| 10 | 200416 |
| 11 | -121216 |
| 12 | -4894016 |
| 13 | -16666880 |
| 14 | 60576896 |
| 15 | 708980224 |
| 16 | 1018614016 |
| 17 | -18612911104 |
| 18 | -109084520960 |
| 19 | 233726715904 |
| 20 | 5080118660096 |
| 21 | 10971406004224 |
| 22 | -169479359707136 |
| 23 | -1160659303014400 |
| 24 | 3153413334470656 |