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 | -2 |
| 2 | 1 |
| 3 | 4 |
| 4 | -3 |
| 5 | 1 |
| 6 | -15 |
| 7 | 11 |
| 8 | -5 |
| 9 | 1 |
| 10 | 107 |
| 11 | -76 |
| 12 | 35 |
| 13 | -9 |
| 14 | 1 |
| 15 | -1475 |
| 16 | 1041 |
| 17 | -476 |
| 18 | 125 |
| 19 | -17 |
| 20 | 1 |
| 21 | 40914 |
| 22 | -28858 |
| 23 | 13177 |
| 24 | -3460 |
| 25 | 479 |
| 26 | -33 |
| 27 | 1 |
| 28 | -2327019 |
| 29 | 1641270 |
| 30 | -749336 |
| 31 | 196731 |
| 32 | -27260 |
| 33 | 1901 |
| 34 | -65 |
| 35 | 1 |
| 36 | 271813931 |
| 37 | -191712888 |
| 38 | 87527566 |
| 39 | -22979242 |
| 40 | 3184213 |
| 41 | -222196 |
| 42 | 7655 |
| 43 | -129 |
| 44 | 1 |
| 45 | -64930439315 |
| 46 | 45796039830 |