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 | 1 |
| 3 | 4 |
| 4 | -5 |
| 5 | 6 |
| 6 | 2 |
| 7 | 8 |
| 8 | -121 |
| 9 | 172 |
| 10 | 44 |
| 11 | 12 |
| 12 | -759 |
| 13 | 14 |
| 14 | 566 |
| 15 | 5536 |
| 16 | -7665 |
| 17 | 18 |
| 18 | -6877 |
| 19 | 20 |
| 20 | 2744 |
| 21 | 70862 |
| 22 | 21218 |
| 23 | 24 |
| 24 | -570573 |
| 25 | 218776 |
| 26 | 104324 |
| 27 | 918568 |
| 28 | 942479 |
| 29 | 30 |
| 30 | -3693495 |
| 31 | 32 |
| 32 | -9408481 |
| 33 | 11779582 |
| 34 | 2223344 |
| 35 | 19935756 |
| 36 | -15628120 |
| 37 | 38 |
| 38 | 9954650 |
| 39 | 145283360 |
| 40 | -371959011 |
| 41 | 42 |
| 42 | -382916059 |