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 | 0 |
| 3 | -2 |
| 4 | 1 |
| 5 | 1 |
| 6 | -7 |
| 7 | -7 |
| 8 | 14 |
| 9 | 14 |
| 10 | 14 |
| 11 | -75 |
| 12 | 69 |
| 13 | -164 |
| 14 | -164 |
| 15 | -164 |
| 16 | 823 |
| 17 | 823 |
| 18 | 823 |
| 19 | 823 |
| 20 | -5942 |
| 21 | 5004 |
| 22 | 5004 |
| 23 | -23653 |
| 24 | 22715 |
| 25 | -52310 |
| 26 | -52310 |
| 27 | 144108 |
| 28 | -173703 |
| 29 | -173703 |
| 30 | -173703 |
| 31 | -173703 |
| 32 | 2004606 |
| 33 | 2004606 |
| 34 | 2004606 |
| 35 | 2004606 |
| 36 | 2004606 |
| 37 | -22153211 |
| 38 | 16934958 |
| 39 | 16934958 |
| 40 | 16934958 |
| 41 | -148645183 |
| 42 | 119269113 |