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 | -6 |
| 5 | 1 |
| 6 | 1 |
| 7 | -12 |
| 8 | 20 |
| 9 | -1 |
| 10 | 1 |
| 11 | -27 |
| 12 | 165 |
| 13 | -35 |
| 14 | 1 |
| 15 | 1 |
| 16 | -123 |
| 17 | 1255 |
| 18 | -511 |
| 19 | 54 |
| 20 | -1 |
| 21 | 1 |
| 22 | -300 |
| 23 | 9266 |
| 24 | -6003 |
| 25 | 1197 |
| 26 | -82 |
| 27 | 1 |
| 28 | 1 |
| 29 | -558 |
| 30 | 77523 |
| 31 | -71564 |
| 32 | 20779 |
| 33 | -2463 |
| 34 | 111 |
| 35 | -1 |
| 36 | 1 |
| 37 | -2841 |
| 38 | 688624 |
| 39 | -817771 |
| 40 | 315489 |
| 41 | -54393 |
| 42 | 4386 |
| 43 | -144 |
| 44 | 1 |
| 45 | 1 |
| 46 | -9093 |