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 | 40 |
| 2 | 142 |
| 3 | -110960 |
| 4 | -5059508 |
| 5 | 444738400 |
| 6 | 54673349320 |
| 7 | -1703637550400 |
| 8 | -626141705175920 |
| 9 | -5174439819171200 |
| 10 | 8009253862551574240 |
| 11 | 395813487065579065600 |
| 12 | -112619873964978985037120 |
| 13 | -11429947728298530733222400 |
| 14 | 1677399182000270453064676480 |