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 | 9 |
| 2 | -17 |
| 3 | -1917 |
| 4 | -12255 |
| 5 | 641169 |
| 6 | 11775471 |
| 7 | -271028133 |
| 8 | -10517226303 |
| 9 | 117831019545 |
| 10 | 10336672775151 |
| 11 | -22444344177741 |
| 12 | -11344932349212447 |
| 13 | -75709842389888607 |
| 14 | 13772055231387660015 |
| 15 | 227822400841416108939 |
| 16 | -18194519582567115241599 |