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 | -11 |
| 5 | 1 |
| 6 | 1 |
| 7 | -30 |
| 8 | 57 |
| 9 | -1 |
| 10 | 1 |
| 11 | -50 |
| 12 | 395 |
| 13 | -203 |
| 14 | 1 |
| 15 | 1 |
| 16 | -70 |
| 17 | 1133 |
| 18 | -3221 |
| 19 | 574 |
| 20 | -1 |
| 21 | 1 |
| 22 | -90 |
| 23 | 2271 |
| 24 | -15840 |
| 25 | 19011 |
| 26 | -1386 |
| 27 | 1 |
| 28 | 1 |
| 29 | -110 |
| 30 | 3809 |
| 31 | -45980 |
| 32 | 156892 |
| 33 | -88729 |
| 34 | 2982 |
| 35 | -1 |
| 36 | 1 |
| 37 | -130 |
| 38 | 5747 |
| 39 | -101640 |
| 40 | 660617 |
| 41 | -1195097 |
| 42 | 346295 |
| 43 | -5874 |