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 | 5 |
| 4 | -1 |
| 5 | 1 |
| 6 | -2 |
| 7 | 1 |
| 8 | -104 |
| 9 | 1 |
| 10 | -19 |
| 11 | 1 |
| 12 | -769 |
| 13 | -7687 |
| 14 | -4916 |
| 15 | -261 |
| 16 | -1262 |
| 17 | -20453 |
| 18 | -57923 |
| 19 | -1066503 |
| 20 | -5979161 |
| 21 | -17475593 |
| 22 | -8958244 |
| 23 | -201189767 |
| 24 | -79457304 |
| 25 | -42275159 |
| 26 | -87410483 |
| 27 | -13046193 |
| 28 | -23669663 |
| 29 | -612055937 |
| 30 | -1025912126 |
| 31 | -28568429291 |
| 32 | -128848674356 |
| 33 | -125809879051 |