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 | 0 |
| 2 | -2 |
| 3 | -4 |
| 4 | -4 |
| 5 | 2 |
| 6 | 22 |
| 7 | 72 |
| 8 | 184 |
| 9 | 422 |
| 10 | 914 |
| 11 | 1916 |
| 12 | 3940 |
| 13 | 8010 |
| 14 | 16174 |
| 15 | 32528 |
| 16 | 65264 |
| 17 | 130766 |
| 18 | 261802 |
| 19 | 523908 |
| 20 | 1048156 |
| 21 | 2096690 |
| 22 | 4193798 |
| 23 | 8388056 |
| 24 | 16776616 |
| 25 | 33553782 |
| 26 | 67108162 |
| 27 | 134216972 |
| 28 | 268434644 |
| 29 | 536870042 |
| 30 | 1073740894 |
| 31 | 2147482656 |
| 32 | 4294966240 |
| 33 | 8589933470 |
| 34 | 17179867994 |