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 | -18 |
| 5 | 1 |
| 6 | 1 |
| 7 | -84 |
| 8 | 116 |
| 9 | -1 |
| 10 | 1 |
| 11 | -439 |
| 12 | 1221 |
| 13 | -839 |
| 14 | 1 |
| 15 | 1 |
| 16 | -2475 |
| 17 | 10435 |
| 18 | -13855 |
| 19 | 5658 |
| 20 | -1 |
| 21 | 1 |
| 22 | -14312 |
| 23 | 81690 |
| 24 | -165715 |
| 25 | 138669 |
| 26 | -39038 |
| 27 | 1 |
| 28 | 1 |
| 29 | -83270 |
| 30 | 601411 |
| 31 | -1661956 |
| 32 | 2164099 |
| 33 | -1292751 |
| 34 | 266899 |
| 35 | -1 |
| 36 | 1 |
| 37 | -485157 |