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 | 0 |
| 3 | 8 |
| 4 | 16 |
| 5 | -8 |
| 6 | -48 |
| 7 | -56 |
| 8 | 0 |
| 9 | 116 |
| 10 | 256 |
| 11 | 264 |
| 12 | -32 |
| 13 | -648 |
| 14 | -1296 |
| 15 | -1392 |
| 16 | -352 |
| 17 | 2040 |
| 18 | 5200 |
| 19 | 7368 |
| 20 | 6112 |
| 21 | -784 |
| 22 | -13744 |
| 23 | -29304 |
| 24 | -39648 |
| 25 | -33804 |
| 26 | -1376 |
| 27 | 60368 |
| 28 | 139552 |
| 29 | 205304 |
| 30 | 210208 |
| 31 | 103432 |
| 32 | -146528 |
| 33 | -521744 |
| 34 | -928480 |
| 35 | -1190000 |
| 36 | -1069904 |
| 37 | -339720 |
| 38 | 1110864 |
| 39 | 3146640 |
| 40 | 5278624 |