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) |
|---|---|
| 1 | 1 |
| 2 | -7 |
| 3 | 74 |
| 4 | -950 |
| 5 | 14675 |
| 6 | -265261 |
| 7 | 5499540 |
| 8 | -128718188 |
| 9 | 3358066213 |
| 10 | -96641933787 |
| 11 | 3041786442934 |
| 12 | -103951418936138 |
| 13 | 3833424966763151 |
| 14 | -151734670591049073 |
| 15 | 6416673685121841552 |
| 16 | -288731231494230984304 |
| 17 | 13774353220573494006705 |
| 18 | -694460992134764182350927 |