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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | -2 |
| 6 | 1 |
| 7 | -8 |
| 8 | 12 |
| 9 | -6 |
| 10 | 1 |
| 11 | 81 |
| 12 | -108 |
| 13 | 54 |
| 14 | -12 |
| 15 | 1 |
| 16 | -1024 |
| 17 | 1280 |
| 18 | -640 |
| 19 | 160 |
| 20 | -20 |
| 21 | 1 |
| 22 | 15625 |
| 23 | -18750 |
| 24 | 9375 |
| 25 | -2500 |
| 26 | 375 |
| 27 | -30 |
| 28 | 1 |
| 29 | -279936 |
| 30 | 326592 |
| 31 | -163296 |
| 32 | 45360 |
| 33 | -7560 |
| 34 | 756 |
| 35 | -42 |
| 36 | 1 |
| 37 | 5764801 |
| 38 | -6588344 |
| 39 | 3294172 |
| 40 | -941192 |
| 41 | 168070 |
| 42 | -19208 |
| 43 | 1372 |
| 44 | -56 |
| 45 | 1 |
| 46 | -134217728 |
| 47 | 150994944 |
| 48 | -75497472 |
| 49 | 22020096 |
| 50 | -4128768 |