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 | -3 |
| 1 | -12 |
| 2 | 1107 |
| 3 | 33345 |
| 4 | 151593 |
| 5 | -17376120 |
| 6 | -544200660 |
| 7 | -2551628817 |
| 8 | 298555990425 |
| 9 | 9538198578972 |
| 10 | 47571625958796 |
| 11 | -5260288747038957 |
| 12 | -171603777320158968 |
| 13 | -932936371186135044 |
| 14 | 93260709219956914584 |
| 15 | 3120592373597958070140 |
| 16 | 18795651984942284003265 |