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 | -3 |
| 2 | -6 |
| 3 | 78 |
| 4 | 696 |
| 5 | -6888 |
| 6 | -164976 |
| 7 | 891888 |
| 8 | 64108416 |
| 9 | 60001152 |
| 10 | -35965476096 |
| 11 | -360892100352 |
| 12 | 26498019265536 |
| 13 | 633590774356992 |
| 14 | -23310702740207616 |
| 15 | -1122674884723771392 |
| 16 | 20851651616596525056 |