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 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 0 |
| 4 | 14 |
| 5 | 20 |
| 6 | 32 |
| 7 | 0 |
| 8 | 254 |
| 9 | 492 |
| 10 | 932 |
| 11 | 1584 |
| 12 | 3104 |
| 13 | 4160 |
| 14 | 8192 |
| 15 | 0 |
| 16 | 65534 |
| 17 | 131036 |
| 18 | 261836 |
| 19 | 521968 |
| 20 | 1038884 |
| 21 | 2044440 |
| 22 | 4029984 |
| 23 | 7607296 |
| 24 | 15306272 |
| 25 | 27305280 |
| 26 | 53360192 |
| 27 | 77448960 |
| 28 | 201334784 |
| 29 | 268451840 |
| 30 | 536870912 |
| 31 | 0 |
| 32 | 4294967294 |