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 | -1 |
| 2 | 11 |
| 3 | -191 |
| 4 | 2497 |
| 5 | -14797 |
| 6 | 92427157 |
| 7 | -36740617 |
| 8 | 61430943169 |
| 9 | -23133945892303 |
| 10 | 16399688681447 |
| 11 | -3098811853954483 |
| 12 | 312017413700271173731 |
| 13 | -69213549869569446541 |
| 14 | 53903636903066465730877 |
| 15 | -522273861988577772410712439 |
| 16 | 644962185719868974672135609261 |