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 | -3 |
| 2 | -10 |
| 3 | 207 |
| 4 | 590 |
| 5 | -10443 |
| 6 | -87730 |
| 7 | 8725719 |
| 8 | 24386030 |
| 9 | -779929533 |
| 10 | -10896056050 |
| 11 | 851890629837 |
| 12 | 7140660673070 |
| 13 | -329895072654423 |
| 14 | -6452172716731570 |
| 15 | 2751576311657256183 |
| 16 | 7688003030273049710 |
| 17 | -464469099846794359113 |
| 18 | -11679689713099591922290 |