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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | -4 |
| 6 | 6 |
| 7 | -4 |
| 8 | 1 |
| 9 | 0 |
| 10 | 0 |
| 11 | 16 |
| 12 | -32 |
| 13 | 24 |
| 14 | -8 |
| 15 | 1 |
| 16 | 1 |
| 17 | -12 |
| 18 | 58 |
| 19 | -144 |
| 20 | 195 |
| 21 | -144 |
| 22 | 58 |
| 23 | -12 |
| 24 | 1 |
| 25 | 0 |
| 26 | 0 |
| 27 | 81 |
| 28 | -432 |
| 29 | 972 |
| 30 | -1200 |
| 31 | 886 |
| 32 | -400 |
| 33 | 108 |
| 34 | -16 |
| 35 | 1 |
| 36 | 1 |
| 37 | -24 |
| 38 | 236 |
| 39 | -1228 |
| 40 | 3678 |
| 41 | -6612 |
| 42 | 7490 |
| 43 | -5532 |
| 44 | 2701 |
| 45 | -864 |
| 46 | 174 |
| 47 | -20 |
| 48 | 1 |
| 49 | 0 |
| 50 | 0 |
| 51 | 256 |
| 52 | -2560 |
| 53 | 11136 |
| 54 | -27776 |
| 55 | 44176 |
| 56 | -47232 |
| 57 | 34912 |
| 58 | -18048 |
| 59 | 6504 |
| 60 | -1600 |
| 61 | 256 |
| 62 | -24 |
| 63 | 1 |