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 | -271 |
| 3 | -11605 |
| 4 | 191041 |
| 5 | 20298091 |
| 6 | -151161359 |
| 7 | -49403884981 |
| 8 | -128655965695 |
| 9 | 153515367677771 |
| 10 | 2142567291427441 |
| 11 | -578212001091160469 |
| 12 | -15599082172637890751 |
| 13 | 2548319349233802047915 |
| 14 | 107524435593334513794161 |
| 15 | -12802407797068425987221749 |