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 | -4 |
| 2 | -12 |
| 3 | 188 |
| 4 | 2580 |
| 5 | -28324 |
| 6 | -1123212 |
| 7 | 4593788 |
| 8 | 791677140 |
| 9 | 4687508636 |
| 10 | -789960600012 |
| 11 | -16633684281412 |
| 12 | 997739785828500 |
| 13 | 46516458962719196 |
| 14 | -1370408093916825612 |
| 15 | -140930266128553137412 |