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 | -14 |
| 3 | -12420 |
| 4 | -209364 |
| 5 | 13023288 |
| 6 | 588244344 |
| 7 | -15822829872 |
| 8 | -1676597055600 |
| 9 | 12606184973088 |
| 10 | 5327119572650784 |
| 11 | 53279247098676672 |
| 12 | -18847204123339434816 |
| 13 | -555350300452342408320 |
| 14 | 72818309509811313231744 |
| 15 | 3938647192917087914341632 |
| 16 | -298293179742235775626792704 |