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 | -3 |
| 4 | -1 |
| 5 | 5 |
| 6 | 13 |
| 7 | 27 |
| 8 | 41 |
| 9 | 43 |
| 10 | 25 |
| 11 | -23 |
| 12 | -157 |
| 13 | -447 |
| 14 | -1011 |
| 15 | -2087 |
| 16 | -4081 |
| 17 | -7685 |
| 18 | -14141 |
| 19 | -25707 |
| 20 | -46251 |
| 21 | -82729 |
| 22 | -147295 |
| 23 | -261317 |
| 24 | -462403 |
| 25 | -816653 |
| 26 | -1439457 |
| 27 | -2532779 |
| 28 | -4448035 |
| 29 | -7794637 |
| 30 | -13624815 |
| 31 | -23744693 |
| 32 | -41230561 |
| 33 | -71277787 |