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 | -449 |
| 3 | -1349 |
| 4 | 604801 |
| 5 | 3033001 |
| 6 | -1357769249 |
| 7 | -9546871949 |
| 8 | 4267426262401 |
| 9 | 38636165278801 |
| 10 | -17244440197445249 |
| 11 | -191107183952049749 |
| 12 | 85168871793401932801 |
| 13 | 1117147665134470577401 |
| 14 | -497120752326266836308449 |
| 15 | -7535151042673431473934749 |
| 16 | 3348029927159627713608096001 |