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 | 8 |
| 5 | -8 |
| 6 | 4 |
| 7 | 8 |
| 8 | -32 |
| 9 | 72 |
| 10 | -128 |
| 11 | 192 |
| 12 | -240 |
| 13 | 224 |
| 14 | -64 |
| 15 | -352 |
| 16 | 1152 |
| 17 | -2432 |
| 18 | 4160 |
| 19 | -6016 |
| 20 | 7168 |
| 21 | -6016 |
| 22 | 0 |
| 23 | 14336 |
| 24 | -40704 |
| 25 | 81408 |
| 26 | -134144 |
| 27 | 186880 |
| 28 | -210944 |
| 29 | 153600 |
| 30 | 66560 |
| 31 | -555008 |
| 32 | 1417216 |
| 33 | -2701312 |
| 34 | 4292608 |
| 35 | -5750784 |
| 36 | 6098944 |
| 37 | -3612672 |
| 38 | -4276224 |
| 39 | 20750336 |
| 40 | -48726016 |
| 41 | 88899584 |