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 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 0 |
| 5 | -46 |
| 6 | -192 |
| 7 | -266 |
| 8 | 1792 |
| 9 | 14114 |
| 10 | 34816 |
| 11 | -171930 |
| 12 | -2027520 |
| 13 | -6522382 |
| 14 | 34750464 |
| 15 | 496296022 |
| 16 | 1748500480 |
| 17 | -12731696062 |
| 18 | -186550845440 |
| 19 | -617309234490 |
| 20 | 7292215885824 |
| 21 | 99199654760978 |
| 22 | 248883934396416 |
| 23 | -5836506132182090 |
| 24 | -69729013345550336 |