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 | 14 |
| 2 | -544 |
| 3 | 34496 |
| 4 | -2512254 |
| 5 | 197053696 |
| 6 | -16194254272 |
| 7 | 1374326128896 |
| 8 | -119403428951808 |
| 9 | 10561444878559246 |
| 10 | -947458249960057024 |
| 11 | 85971010094510200128 |
| 12 | -7874673015172093889024 |
| 13 | 727016151987267244001536 |
| 14 | -67573426491012510177925760 |
| 15 | 6317185611058637805840976640 |