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 | 3 |
| 3 | -2 |
| 4 | 5 |
| 5 | -5 |
| 6 | 2 |
| 7 | 7 |
| 8 | -7 |
| 9 | 14 |
| 10 | -8 |
| 11 | 9 |
| 12 | -6 |
| 13 | 63 |
| 14 | -66 |
| 15 | 24 |
| 16 | 11 |
| 17 | 0 |
| 18 | 209 |
| 19 | -264 |
| 20 | 308 |
| 21 | -144 |
| 22 | 13 |
| 23 | 13 |
| 24 | 559 |
| 25 | -689 |
| 26 | 2236 |
| 27 | -2132 |
| 28 | 720 |
| 29 | 15 |
| 30 | 35 |
| 31 | 1281 |
| 32 | -1255 |
| 33 | 11640 |
| 34 | -14980 |
| 35 | 14064 |
| 36 | -5760 |
| 37 | 17 |
| 38 | 68 |
| 39 | 2618 |
| 40 | -1360 |
| 41 | 47753 |
| 42 | -68068 |
| 43 | 145452 |
| 44 | -126480 |
| 45 | 40320 |