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) |
|---|---|
| 1 | 1 |
| 2 | 456 |
| 3 | 50652 |
| 4 | -316352 |
| 5 | -2377410 |
| 6 | 23097312 |
| 7 | -16917544 |
| 8 | -383331840 |
| 9 | 1403363637 |
| 10 | -1084098960 |
| 11 | -16212108 |
| 12 | -16023861504 |
| 13 | 50421615062 |
| 14 | -7714400064 |
| 15 | -120420571320 |
| 16 | -8939761664 |
| 17 | 225070099506 |
| 18 | 639933818472 |