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 | -115 |
| 3 | 4563 |
| 4 | 103385 |
| 5 | -7273809 |
| 6 | -244682395 |
| 7 | 24273348363 |
| 8 | 1087614676145 |
| 9 | -138831344004249 |
| 10 | -7774941663643075 |
| 11 | 1213102349164829763 |
| 12 | 81523593055504608905 |
| 13 | -15032750772611708561889 |
| 14 | -1178611204087999571493355 |
| 15 | 250769133987648650402960763 |
| 16 | 22469741388306099177659661665 |