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 | -8 |
| 5 | 8 |
| 6 | -1 |
| 7 | 18 |
| 8 | -48 |
| 9 | 32 |
| 10 | 1 |
| 11 | -32 |
| 12 | 160 |
| 13 | -256 |
| 14 | 128 |
| 15 | -1 |
| 16 | 50 |
| 17 | -400 |
| 18 | 1120 |
| 19 | -1280 |
| 20 | 512 |
| 21 | 1 |
| 22 | -72 |
| 23 | 840 |
| 24 | -3584 |
| 25 | 6912 |
| 26 | -6144 |
| 27 | 2048 |
| 28 | -1 |
| 29 | 98 |
| 30 | -1568 |
| 31 | 9408 |
| 32 | -26880 |
| 33 | 39424 |
| 34 | -28672 |
| 35 | 8192 |
| 36 | 1 |
| 37 | -128 |
| 38 | 2688 |
| 39 | -21504 |
| 40 | 84480 |
| 41 | -180224 |
| 42 | 212992 |
| 43 | -131072 |
| 44 | 32768 |
| 45 | -1 |
| 46 | 162 |
| 47 | -4320 |
| 48 | 44352 |
| 49 | -228096 |
| 50 | 658944 |
| 51 | -1118208 |