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 | -1 |
| 2 | 1 |
| 3 | 5 |
| 4 | -6 |
| 5 | 1 |
| 6 | -113 |
| 7 | 140 |
| 8 | -28 |
| 9 | 1 |
| 10 | 10879 |
| 11 | -13560 |
| 12 | 2800 |
| 13 | -120 |
| 14 | 1 |
| 15 | -4324129 |
| 16 | 5395984 |
| 17 | -1120960 |
| 18 | 49600 |
| 19 | -496 |
| 20 | 1 |
| 21 | 6984271295 |
| 22 | -8717444064 |
| 23 | 1813050624 |
| 24 | -80709120 |
| 25 | 833280 |
| 26 | -2016 |
| 27 | 1 |
| 28 | -45479775838337 |
| 29 | 56768157085760 |
| 30 | -11809230892032 |
| 31 | 526302695424 |
| 32 | -5466697728 |
| 33 | 13655040 |
| 34 | -8128 |
| 35 | 1 |