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 | -4 |
| 2 | 1 |
| 3 | 18 |
| 4 | -10 |
| 5 | 1 |
| 6 | -96 |
| 7 | 86 |
| 8 | -18 |
| 9 | 1 |
| 10 | 600 |
| 11 | -756 |
| 12 | 246 |
| 13 | -28 |
| 14 | 1 |
| 15 | -4320 |
| 16 | 7092 |
| 17 | -3168 |
| 18 | 552 |
| 19 | -40 |
| 20 | 1 |
| 21 | 35280 |
| 22 | -71856 |
| 23 | 41112 |
| 24 | -9720 |
| 25 | 1070 |
| 26 | -54 |
| 27 | 1 |
| 28 | -322560 |
| 29 | 787824 |
| 30 | -552240 |
| 31 | 165720 |
| 32 | -24600 |
| 33 | 1878 |
| 34 | -70 |
| 35 | 1 |
| 36 | 3265920 |
| 37 | -9329760 |
| 38 | 7768080 |
| 39 | -2835360 |
| 40 | 531480 |
| 41 | -54516 |
| 42 | 3066 |
| 43 | -88 |