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) |
|---|---|
| 0 | 1 |
| 1 | -5 |
| 2 | 1 |
| 3 | 30 |
| 4 | -11 |
| 5 | 1 |
| 6 | -210 |
| 7 | 107 |
| 8 | -18 |
| 9 | 1 |
| 10 | 1680 |
| 11 | -1066 |
| 12 | 251 |
| 13 | -26 |
| 14 | 1 |
| 15 | -15120 |
| 16 | 11274 |
| 17 | -3325 |
| 18 | 485 |
| 19 | -35 |
| 20 | 1 |
| 21 | 151200 |
| 22 | -127860 |
| 23 | 44524 |
| 24 | -8175 |
| 25 | 835 |
| 26 | -45 |
| 27 | 1 |
| 28 | -1663200 |
| 29 | 1557660 |
| 30 | -617624 |
| 31 | 134449 |
| 32 | -17360 |
| 33 | 1330 |
| 34 | -56 |
| 35 | 1 |
| 36 | 19958400 |
| 37 | -20355120 |
| 38 | 8969148 |
| 39 | -2231012 |
| 40 | 342769 |
| 41 | -33320 |
| 42 | 2002 |
| 43 | -68 |
| 44 | 1 |