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 | 3 |
| 4 | -5 |
| 5 | 1 |
| 6 | 15 |
| 7 | -31 |
| 8 | 14 |
| 9 | -1 |
| 10 | 105 |
| 11 | -247 |
| 12 | 157 |
| 13 | -30 |
| 14 | 1 |
| 15 | 945 |
| 16 | -2433 |
| 17 | 1892 |
| 18 | -553 |
| 19 | 55 |
| 20 | -1 |
| 21 | 10395 |
| 22 | -28653 |
| 23 | 25573 |
| 24 | -9620 |
| 25 | 1554 |
| 26 | -91 |
| 27 | 1 |
| 28 | 135135 |
| 29 | -393279 |
| 30 | 388810 |
| 31 | -173773 |
| 32 | 37550 |
| 33 | -3738 |
| 34 | 140 |
| 35 | -1 |
| 36 | 2027025 |
| 37 | -6169455 |