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 | 1 |
| 2 | -2 |
| 3 | 1 |
| 4 | -4 |
| 5 | 2 |
| 6 | 1 |
| 7 | -6 |
| 8 | 8 |
| 9 | -4 |
| 10 | 1 |
| 11 | -8 |
| 12 | 18 |
| 13 | -16 |
| 14 | -4 |
| 15 | 1 |
| 16 | -10 |
| 17 | 32 |
| 18 | -44 |
| 19 | 12 |
| 20 | -48 |
| 21 | 1 |
| 22 | -12 |
| 23 | 50 |
| 24 | -96 |
| 25 | 72 |
| 26 | -96 |
| 27 | -336 |
| 28 | 1 |
| 29 | -14 |
| 30 | 72 |
| 31 | -180 |
| 32 | 216 |
| 33 | -216 |
| 34 | -480 |
| 35 | -2928 |
| 36 | 1 |
| 37 | -16 |
| 38 | 98 |
| 39 | -304 |
| 40 | 500 |
| 41 | -544 |
| 42 | -376 |
| 43 | -4672 |
| 44 | -28144 |
| 45 | 1 |
| 46 | -18 |
| 47 | 128 |
| 48 | -476 |
| 49 | 996 |
| 50 | -1312 |
| 51 | 256 |
| 52 | -5856 |
| 53 | -45520 |
| 54 | -298528 |