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 | -5 |
| 3 | 11 |
| 4 | -1103 |
| 5 | 1627 |
| 6 | -374473 |
| 7 | 1220651 |
| 8 | -92146157 |
| 9 | 31595747 |
| 10 | -20000218625 |
| 11 | 176776749931 |
| 12 | -5607610511548471 |
| 13 | 374753409522157 |
| 14 | -55207553310144173 |
| 15 | 202183428095237231 |
| 16 | -1614396705602979083803 |