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 | 18 |
| 2 | -734 |
| 3 | -51300 |
| 4 | 1406316 |
| 5 | 242415288 |
| 6 | -3075936456 |
| 7 | -1594219104432 |
| 8 | -5915558486640 |
| 9 | 13386990447152928 |
| 10 | 297293775958538784 |
| 11 | -136283070963624280128 |
| 12 | -5913000241950711410496 |
| 13 | 1623815864599061055116160 |
| 14 | 110556090890573183732052864 |
| 15 | -22061950950410975041203610368 |