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 | 12 |
| 2 | 46 |
| 3 | -1800 |
| 4 | -35124 |
| 5 | 284112 |
| 6 | 20620104 |
| 7 | 80383392 |
| 8 | -13180790640 |
| 9 | -221190067008 |
| 10 | 8971176540384 |
| 11 | 324420384152448 |
| 12 | -5777883700704576 |
| 13 | -450852976171733760 |
| 14 | 1950788120636824704 |
| 15 | 641979740755260615168 |
| 16 | 4836098351726995067136 |