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 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | -4 |
| 4 | 2 |
| 5 | 0 |
| 6 | -12 |
| 7 | 12 |
| 8 | 3 |
| 9 | 0 |
| 10 | 32 |
| 11 | -48 |
| 12 | -24 |
| 13 | 4 |
| 14 | 0 |
| 15 | 80 |
| 16 | -160 |
| 17 | -120 |
| 18 | 40 |
| 19 | 5 |
| 20 | 0 |
| 21 | -192 |
| 22 | 480 |
| 23 | 480 |
| 24 | -240 |
| 25 | -60 |
| 26 | 6 |
| 27 | 0 |
| 28 | -448 |
| 29 | 1344 |
| 30 | 1680 |
| 31 | -1120 |
| 32 | -420 |
| 33 | 84 |
| 34 | 7 |
| 35 | 0 |
| 36 | 1024 |
| 37 | -3584 |
| 38 | -5376 |
| 39 | 4480 |
| 40 | 2240 |
| 41 | -672 |
| 42 | -112 |
| 43 | 8 |
| 44 | 0 |
| 45 | 2304 |
| 46 | -9216 |
| 47 | -16128 |
| 48 | 16128 |
| 49 | 10080 |
| 50 | -4032 |
| 51 | -1008 |
| 52 | 144 |
| 53 | 9 |
| 54 | 0 |