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 | -66 |
| 2 | -40392 |
| 3 | -9009264 |
| 4 | -3725341158 |
| 5 | -1400292801072 |
| 6 | -604993149612720 |
| 7 | -262280205541007808 |
| 8 | -118717180239835505592 |
| 9 | -54520207050101542651506 |
| 10 | -25525844887805197307977968 |
| 11 | -12095360676632550886664063760 |
| 12 | -5797006133905562955666277287792 |
| 13 | -2803076705590018145443840156918512 |