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 | 11 |
| 2 | -3952 |
| 3 | -529713 |
| 4 | -16756480 |
| 5 | -243891793 |
| 6 | -2173796352 |
| 7 | -13805455393 |
| 8 | -68289495040 |
| 9 | -277269756129 |
| 10 | -938082635776 |
| 11 | -2395420006033 |
| 12 | 0 |
| 13 | 83695120256591 |
| 14 | 1227224552173568 |
| 15 | 15277275236695743 |
| 16 | 184602783918325760 |