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 | 1 |
| 4 | -1 |
| 5 | -2 |
| 6 | 1 |
| 7 | -1 |
| 8 | -4 |
| 9 | -7 |
| 10 | 1 |
| 11 | -1 |
| 12 | -8 |
| 13 | -23 |
| 14 | -57 |
| 15 | 1 |
| 16 | -1 |
| 17 | -16 |
| 18 | -73 |
| 19 | -229 |
| 20 | -541 |
| 21 | 1 |
| 22 | -1 |
| 23 | -32 |
| 24 | -227 |
| 25 | -927 |
| 26 | -2761 |
| 27 | -7126 |
| 28 | 1 |
| 29 | -1 |
| 30 | -64 |
| 31 | -697 |
| 32 | -3757 |
| 33 | -13969 |
| 34 | -42615 |
| 35 | -108072 |
| 36 | 1 |
| 37 | -1 |
| 38 | -128 |
| 39 | -2123 |
| 40 | -15207 |
| 41 | -70237 |
| 42 | -254580 |
| 43 | -758499 |
| 44 | -1966034 |