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 | -3 |
| 3 | 1 |
| 4 | 18 |
| 5 | -9 |
| 6 | 1 |
| 7 | -162 |
| 8 | 99 |
| 9 | -18 |
| 10 | 1 |
| 11 | 1944 |
| 12 | -1350 |
| 13 | 315 |
| 14 | -30 |
| 15 | 1 |
| 16 | -29160 |
| 17 | 22194 |
| 18 | -6075 |
| 19 | 765 |
| 20 | -45 |
| 21 | 1 |
| 22 | 524880 |
| 23 | -428652 |
| 24 | 131544 |
| 25 | -19845 |
| 26 | 1575 |
| 27 | -63 |
| 28 | 1 |
| 29 | -11022480 |
| 30 | 9526572 |
| 31 | -3191076 |
| 32 | 548289 |
| 33 | -52920 |
| 34 | 2898 |
| 35 | -84 |
| 36 | 1 |
| 37 | 264539520 |
| 38 | -239660208 |