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 | 3 |
| 4 | 4 |
| 5 | 4 |
| 6 | 0 |
| 7 | -14 |
| 8 | -48 |
| 9 | -116 |
| 10 | -232 |
| 11 | -396 |
| 12 | -560 |
| 13 | -560 |
| 14 | 0 |
| 15 | 1912 |
| 16 | 6528 |
| 17 | 15760 |
| 18 | 31520 |
| 19 | 53808 |
| 20 | 76096 |
| 21 | 76096 |
| 22 | 0 |
| 23 | -259808 |
| 24 | -887040 |
| 25 | -2141504 |
| 26 | -4283008 |
| 27 | -7311552 |
| 28 | -10340096 |
| 29 | -10340096 |
| 30 | 0 |
| 31 | 35303296 |
| 32 | 120532992 |
| 33 | 290992384 |
| 34 | 581984768 |