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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 4 |
| 5 | 10 |
| 6 | 20 |
| 7 | 34 |
| 8 | 48 |
| 9 | 48 |
| 10 | 0 |
| 11 | -164 |
| 12 | -560 |
| 13 | -1352 |
| 14 | -2704 |
| 15 | -4616 |
| 16 | -6528 |
| 17 | -6528 |
| 18 | 0 |
| 19 | 22288 |
| 20 | 76096 |
| 21 | 183712 |
| 22 | 367424 |
| 23 | 627232 |
| 24 | 887040 |
| 25 | 887040 |
| 26 | 0 |
| 27 | -3028544 |
| 28 | -10340096 |
| 29 | -24963200 |
| 30 | -49926400 |
| 31 | -85229696 |
| 32 | -120532992 |
| 33 | -120532992 |
| 34 | 0 |
| 35 | 411525376 |
| 36 | 1405035520 |
| 37 | 3392055808 |