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 | 2 |
| 1 | -4 |
| 2 | 8 |
| 3 | 16 |
| 4 | -8992 |
| 5 | -334144 |
| 6 | 698752 |
| 7 | 23349012224 |
| 8 | -1357305243136 |
| 9 | -6319924923392 |
| 10 | 8773495082018816 |
| 11 | 49004477022654464 |
| 12 | -1709650943378038784 |
| 13 | -480380831834367035260928 |
| 14 | 88481173388026066736939008 |
| 15 | 660883915180095254454665216 |