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) |
|---|---|
| 3 | 1 |
| 4 | 0 |
| 5 | -6 |
| 6 | 19 |
| 7 | 17 |
| 8 | -98 |
| 9 | 39 |
| 10 | 291 |
| 11 | -264 |
| 12 | -627 |
| 13 | 773 |
| 14 | 1525 |
| 15 | -2000 |
| 16 | -3895 |
| 17 | 5606 |
| 18 | 8784 |
| 19 | -14325 |
| 20 | -18125 |
| 21 | 32856 |
| 22 | 37727 |
| 23 | -72557 |
| 24 | -77316 |
| 25 | 157044 |
| 26 | 150945 |
| 27 | -326602 |
| 28 | -286320 |
| 29 | 655760 |
| 30 | 536800 |
| 31 | -1287225 |
| 32 | -986584 |
| 33 | 2474251 |
| 34 | 1770786 |
| 35 | -4650780 |
| 36 | -3122412 |
| 37 | 8570426 |
| 38 | 5430403 |
| 39 | -15530336 |
| 40 | -9307817 |
| 41 | 27707720 |