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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 0 |
| 5 | -4 |
| 6 | 0 |
| 7 | -2 |
| 8 | 0 |
| 9 | 26 |
| 10 | 0 |
| 11 | 0 |
| 12 | 80 |
| 13 | 352 |
| 14 | 912 |
| 15 | 0 |
| 16 | 16 |
| 17 | 0 |
| 18 | -1936 |
| 19 | -11552 |
| 20 | -40368 |
| 21 | 0 |
| 22 | 0 |
| 23 | -3904 |
| 24 | -38528 |
| 25 | -176832 |
| 26 | -560896 |
| 27 | -1424960 |
| 28 | 0 |
| 29 | -272 |
| 30 | 0 |
| 31 | 297296 |
| 32 | 3150208 |
| 33 | 17187888 |
| 34 | 65931008 |
| 35 | 201796240 |