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 | -9 |
| 3 | 28 |
| 4 | -57 |
| 5 | 126 |
| 6 | -252 |
| 7 | 344 |
| 8 | -441 |
| 9 | 757 |
| 10 | -1134 |
| 11 | 1332 |
| 12 | -1596 |
| 13 | 2198 |
| 14 | -3096 |
| 15 | 3528 |
| 16 | -3513 |
| 17 | 4914 |
| 18 | -6813 |
| 19 | 6860 |
| 20 | -7182 |
| 21 | 9632 |
| 22 | -11988 |
| 23 | 12168 |
| 24 | -12348 |
| 25 | 15751 |
| 26 | -19782 |
| 27 | 20440 |
| 28 | -19608 |
| 29 | 24390 |
| 30 | -31752 |
| 31 | 29792 |
| 32 | -28089 |
| 33 | 37296 |
| 34 | -44226 |
| 35 | 43344 |
| 36 | -43149 |
| 37 | 50654 |