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 | 4 |
| 2 | -4 |
| 3 | -32 |
| 4 | -4 |
| 5 | 104 |
| 6 | 32 |
| 7 | -192 |
| 8 | -4 |
| 9 | 292 |
| 10 | -104 |
| 11 | -480 |
| 12 | 32 |
| 13 | 680 |
| 14 | 192 |
| 15 | -832 |
| 16 | -4 |
| 17 | 1160 |
| 18 | -292 |
| 19 | -1440 |
| 20 | -104 |
| 21 | 1536 |
| 22 | 480 |
| 23 | -2112 |
| 24 | 32 |
| 25 | 2604 |
| 26 | -680 |
| 27 | -2624 |
| 28 | 192 |
| 29 | 3368 |
| 30 | 832 |
| 31 | -3840 |
| 32 | -4 |
| 33 | 3840 |
| 34 | -1160 |
| 35 | -4992 |
| 36 | -292 |
| 37 | 5480 |
| 38 | 1440 |
| 39 | -5440 |
| 40 | -104 |
| 41 | 6728 |
| 42 | -1536 |
| 43 | -7392 |
| 44 | 480 |
| 45 | 7592 |
| 46 | 2112 |
| 47 | -8832 |
| 48 | 32 |
| 49 | 9412 |
| 50 | -2604 |
| 51 | -9280 |