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 | -6 |
| 2 | 1 |
| 3 | 42 |
| 4 | -13 |
| 5 | 1 |
| 6 | -336 |
| 7 | 146 |
| 8 | -21 |
| 9 | 1 |
| 10 | 3024 |
| 11 | -1650 |
| 12 | 335 |
| 13 | -30 |
| 14 | 1 |
| 15 | -30240 |
| 16 | 19524 |
| 17 | -5000 |
| 18 | 635 |
| 19 | -40 |
| 20 | 1 |
| 21 | 332640 |
| 22 | -245004 |
| 23 | 74524 |
| 24 | -11985 |
| 25 | 1075 |
| 26 | -51 |
| 27 | 1 |
| 28 | -3991680 |
| 29 | 3272688 |
| 30 | -1139292 |
| 31 | 218344 |
| 32 | -24885 |
| 33 | 1687 |
| 34 | -63 |
| 35 | 1 |
| 36 | 51891840 |
| 37 | -46536624 |
| 38 | 18083484 |
| 39 | -3977764 |
| 40 | 541849 |
| 41 | -46816 |
| 42 | 2506 |
| 43 | -76 |
| 44 | 1 |