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 | -4 |
| 3 | -129 |
| 4 | -3689 |
| 5 | -113689 |
| 6 | 7001471 |
| 7 | 7911171596 |
| 8 | 6480598259201 |
| 9 | 5987117709349201 |
| 10 | -4830209396684261199 |
| 11 | -230318343950087449971199 |
| 12 | -5423908604123397486016003604 |
| 13 | -147547506573676549005535542233729 |
| 14 | 739578212227710098047348234126634311 |