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 | -53 |
| 12 | 338 |
| 13 | -224 |
| 14 | 1 |
| 15 | 1 |
| 16 | -80 |
| 17 | 992 |
| 18 | -2600 |
| 19 | 752 |
| 20 | -1 |
| 21 | 1 |
| 22 | -111 |
| 23 | 2171 |
| 24 | -11803 |
| 25 | 15614 |
| 26 | -2304 |
| 27 | 1 |
| 28 | 1 |
| 29 | -146 |
| 30 | 4039 |
| 31 | -35908 |
| 32 | 105335 |
| 33 | -79786 |
| 34 | 6665 |
| 35 | -1 |
| 36 | 1 |
| 37 | -185 |
| 38 | 6776 |
| 39 | -87154 |
| 40 | 434244 |
| 41 | -770624 |
| 42 | 362449 |
| 43 | -18595 |