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 | -6 |
| 2 | -49212 |
| 3 | -10451544 |
| 4 | -4218246978 |
| 5 | -1581565900392 |
| 6 | -677142351901080 |
| 7 | -293172823731286848 |
| 8 | -132241381826055031692 |
| 9 | -60651805300034501958126 |
| 10 | -28350123351848675673466968 |
| 11 | -13420046900399367136336144200 |