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 | -2 |
| 3 | 3 |
| 4 | 3 |
| 5 | -7 |
| 6 | -5 |
| 7 | 12 |
| 8 | -19 |
| 9 | -52 |
| 10 | -52 |
| 11 | -20 |
| 12 | 73 |
| 13 | -919 |
| 14 | 6209 |
| 15 | 2206 |
| 16 | -1869 |
| 17 | -8835 |
| 18 | -4021 |
| 19 | 23202 |
| 20 | -122489 |
| 21 | -174347 |
| 22 | 1106682 |
| 23 | 1114088 |
| 24 | 388318 |
| 25 | -7528057 |
| 26 | 55753005 |
| 27 | 81020413 |
| 28 | -530178192 |
| 29 | -6348221604 |
| 30 | 101952770365 |
| 31 | -371734984964 |
| 32 | -16091176203501 |
| 33 | 90823940064758 |
| 34 | 163339092651834 |
| 35 | -3480231557696967 |