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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | -1 |
| 5 | -1 |
| 6 | 0 |
| 7 | 4 |
| 8 | 9 |
| 9 | 4 |
| 10 | -23 |
| 11 | -78 |
| 12 | -78 |
| 13 | 132 |
| 14 | 694 |
| 15 | 1088 |
| 16 | -443 |
| 17 | -6169 |
| 18 | -13452 |
| 19 | -4646 |
| 20 | 52247 |
| 21 | 155891 |
| 22 | 143796 |
| 23 | -391672 |
| 24 | -1715015 |
| 25 | -2481013 |
| 26 | 2107735 |
| 27 | 17836000 |
| 28 | 35704800 |
| 29 | 3037215 |
| 30 | -172386166 |
| 31 | -465009936 |
| 32 | -338007604 |
| 33 | 1487272659 |
| 34 | 5624864403 |
| 35 | 7125599375 |
| 36 | -10208041482 |