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 | 1 |
| 2 | -3 |
| 3 | -107 |
| 4 | -1095 |
| 5 | 41897 |
| 6 | 3027637 |
| 7 | 34528445 |
| 8 | -11832720271 |
| 9 | -1190157296815 |
| 10 | 22592230600813 |
| 11 | 23107531656941541 |
| 12 | 2633888933338158633 |
| 13 | -362759000929143575815 |
| 14 | -189312598480126813670107 |
| 15 | -18315162183020706728157939 |