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 | 28 |
| 2 | -898 |
| 3 | -119336 |
| 4 | 1189900 |
| 5 | 836209808 |
| 6 | 13406815624 |
| 7 | -8063638544864 |
| 8 | -383633726413168 |
| 9 | 97762575920121280 |
| 10 | 8544799476205933024 |
| 11 | -1405112141642673804928 |
| 12 | -197439019874757039348032 |
| 13 | 22832490910422530976921856 |
| 14 | 4956511354073268289737879680 |