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 | -10 |
| 2 | 25 |
| 3 | 50 |
| 4 | -250 |
| 5 | -52 |
| 6 | 595 |
| 7 | 1450 |
| 8 | -770 |
| 9 | -9370 |
| 10 | 12 |
| 11 | 9210 |
| 12 | 38385 |
| 13 | 50190 |
| 14 | -104650 |
| 15 | -203158 |
| 16 | -345955 |
| 17 | 350830 |
| 18 | 1246115 |
| 19 | 1308710 |
| 20 | 1371409 |
| 21 | -3990420 |
| 22 | -10109715 |
| 23 | -14469950 |
| 24 | 3243700 |
| 25 | 36855516 |
| 26 | 73365400 |
| 27 | 87802340 |
| 28 | -21636795 |
| 29 | -221067620 |
| 30 | -594991713 |
| 31 | -478204790 |
| 32 | -217756880 |
| 33 | 1095013900 |