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 | 2 |
| 3 | -1 |
| 4 | 3 |
| 5 | -4 |
| 6 | 2 |
| 7 | 4 |
| 8 | -9 |
| 9 | 10 |
| 10 | -4 |
| 11 | 5 |
| 12 | -16 |
| 13 | 28 |
| 14 | -24 |
| 15 | 8 |
| 16 | 6 |
| 17 | -25 |
| 18 | 60 |
| 19 | -80 |
| 20 | 56 |
| 21 | -16 |
| 22 | 7 |
| 23 | -36 |
| 24 | 110 |
| 25 | -200 |
| 26 | 216 |
| 27 | -128 |
| 28 | 32 |
| 29 | 8 |
| 30 | -49 |
| 31 | 182 |
| 32 | -420 |
| 33 | 616 |
| 34 | -560 |
| 35 | 288 |
| 36 | -64 |
| 37 | 9 |
| 38 | -64 |
| 39 | 280 |
| 40 | -784 |
| 41 | 1456 |
| 42 | -1792 |
| 43 | 1408 |
| 44 | -640 |
| 45 | 128 |
| 46 | 10 |
| 47 | -81 |
| 48 | 408 |
| 49 | -1344 |
| 50 | 3024 |
| 51 | -4704 |
| 52 | 4992 |
| 53 | -3456 |
| 54 | 1408 |
| 55 | -256 |