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 | -14 |
| 3 | -54 |
| 4 | -232 |
| 5 | -1180 |
| 6 | -7104 |
| 7 | -49756 |
| 8 | -398080 |
| 9 | -3582756 |
| 10 | -35827600 |
| 11 | -394103644 |
| 12 | -4729243776 |
| 13 | -61480169140 |
| 14 | -860722368016 |
| 15 | -12910835520300 |
| 16 | -206573368324864 |
| 17 | -3511747261522756 |
| 18 | -63211450707409680 |