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) |
|---|---|
| 5 | 1 |
| 6 | -53144 |
| 7 | 3177326971 |
| 8 | -187360965026144 |
| 9 | 11065164158125239526 |
| 10 | -653375813208979143531248 |
| 11 | 38581260992855637306941215162 |
| 12 | -2278184404047301621409794099651808 |