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 | -4 |
| 2 | 23 |
| 3 | -184 |
| 4 | 1933 |
| 5 | -25316 |
| 6 | 397699 |
| 7 | -7288408 |
| 8 | 152650649 |
| 9 | -3596802148 |
| 10 | 94165506031 |
| 11 | -2711813462744 |
| 12 | 85195437862693 |
| 13 | -2899579176456964 |
| 14 | 106276755720182363 |
| 15 | -4173542380352243896 |
| 16 | 174823612884063939889 |
| 17 | -7780800729631450594628 |