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 | -1 |
| 3 | 1 |
| 4 | -2 |
| 5 | 0 |
| 6 | 1 |
| 7 | -4 |
| 8 | 4 |
| 9 | -1 |
| 10 | 1 |
| 11 | -8 |
| 12 | 24 |
| 13 | -32 |
| 14 | 14 |
| 15 | 8 |
| 16 | -8 |
| 17 | 0 |
| 18 | 0 |
| 19 | 1 |
| 20 | -16 |
| 21 | 112 |
| 22 | -448 |
| 23 | 1116 |
| 24 | -1744 |
| 25 | 1552 |
| 26 | -384 |
| 27 | -700 |
| 28 | 736 |
| 29 | -160 |
| 30 | -128 |
| 31 | 64 |
| 32 | 0 |
| 33 | 0 |
| 34 | 0 |
| 35 | -1 |
| 36 | 1 |
| 37 | -32 |
| 38 | 480 |
| 39 | -4480 |
| 40 | 29112 |
| 41 | -139552 |
| 42 | 509600 |
| 43 | -1441024 |
| 44 | 3166616 |
| 45 | -5345344 |
| 46 | 6668992 |
| 47 | -5473536 |
| 48 | 1494624 |