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 | 0 |
| 1 | -1 |
| 2 | -2 |
| 3 | 0 |
| 4 | 8 |
| 5 | 15 |
| 6 | -6 |
| 7 | -77 |
| 8 | -120 |
| 9 | 117 |
| 10 | 770 |
| 11 | 946 |
| 12 | -1728 |
| 13 | -7735 |
| 14 | -6930 |
| 15 | 22800 |
| 16 | 76960 |
| 17 | 42245 |
| 18 | -282150 |
| 19 | -751640 |
| 20 | -125800 |
| 21 | 3341205 |
| 22 | 7145710 |
| 23 | -2002725 |
| 24 | -38228232 |
| 25 | -65418925 |
| 26 | 55550014 |
| 27 | 424605078 |
| 28 | 566938400 |
| 29 | -936604097 |
| 30 | -4587287310 |