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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | -1 |
| 5 | -2 |
| 6 | -1 |
| 7 | 2 |
| 8 | 7 |
| 9 | 8 |
| 10 | -1 |
| 11 | -26 |
| 12 | -49 |
| 13 | -28 |
| 14 | 103 |
| 15 | 314 |
| 16 | 359 |
| 17 | -344 |
| 18 | -2113 |
| 19 | -3682 |
| 20 | -161 |
| 21 | 14684 |
| 22 | 36791 |
| 23 | 25762 |
| 24 | -100297 |
| 25 | -373456 |
| 26 | -472241 |
| 27 | 587846 |
| 28 | 3877487 |
| 29 | 7149988 |
| 30 | -1111801 |
| 31 | -40808566 |
| 32 | -103472249 |
| 33 | -56751688 |
| 34 | 424662623 |
| 35 | 1490284654 |
| 36 | 1674543359 |
| 37 | -4121143444 |