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 | 18 |
| 7 | -36 |
| 8 | 12 |
| 9 | -1 |
| 10 | 162 |
| 11 | -360 |
| 12 | 153 |
| 13 | -22 |
| 14 | 1 |
| 15 | 1944 |
| 16 | -4644 |
| 17 | 2295 |
| 18 | -435 |
| 19 | 35 |
| 20 | -1 |
| 21 | 29160 |
| 22 | -73548 |
| 23 | 40419 |
| 24 | -9135 |
| 25 | 990 |
| 26 | -51 |
| 27 | 1 |
| 28 | 524880 |
| 29 | -1382184 |
| 30 | 823284 |
| 31 | -210924 |
| 32 | 27720 |
| 33 | -1953 |
| 34 | 70 |
| 35 | -1 |
| 36 | 11022480 |