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) |
|---|---|
| 2 | 1 |
| 3 | 0 |
| 4 | -3 |
| 5 | 6 |
| 6 | 6 |
| 7 | -18 |
| 8 | -4 |
| 9 | 36 |
| 10 | 11 |
| 11 | -74 |
| 12 | -30 |
| 13 | 178 |
| 14 | 40 |
| 15 | -366 |
| 16 | -42 |
| 17 | 680 |
| 18 | 79 |
| 19 | -1264 |
| 20 | -110 |
| 21 | 2320 |
| 22 | 75 |
| 23 | -4070 |
| 24 | -7 |
| 25 | 6938 |
| 26 | -96 |
| 27 | -11650 |
| 28 | 413 |
| 29 | 19276 |
| 30 | -1157 |
| 31 | -31296 |
| 32 | 2492 |
| 33 | 49898 |
| 34 | -4669 |
| 35 | -78576 |
| 36 | 8446 |
| 37 | 122458 |
| 38 | -15073 |
| 39 | -188430 |
| 40 | 25744 |
| 41 | 286508 |
| 42 | -42200 |
| 43 | -431650 |
| 44 | 68180 |
| 45 | 644748 |
| 46 | -108998 |
| 47 | -954360 |
| 48 | 170817 |