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 | 16 |
| 2 | -1202 |
| 3 | -65888 |
| 4 | 4203340 |
| 5 | 451512256 |
| 6 | -23418152504 |
| 7 | -4324519655552 |
| 8 | 169813349966992 |
| 9 | 53158210861830400 |
| 10 | -1377759404477582624 |
| 11 | -797090864837128553984 |
| 12 | 9343051491617413259968 |
| 13 | 14095390595056279792663552 |
| 14 | 48438051548784025753183360 |
| 15 | -286940104001508238715797489664 |