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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 4 |
| 5 | 4 |
| 6 | 0 |
| 7 | 10 |
| 8 | 32 |
| 9 | 30 |
| 10 | 0 |
| 11 | 94 |
| 12 | 344 |
| 13 | 316 |
| 14 | 0 |
| 15 | 1096 |
| 16 | 4096 |
| 17 | 3856 |
| 18 | 0 |
| 19 | 13798 |
| 20 | 52432 |
| 21 | 49940 |
| 22 | 0 |
| 23 | 182362 |
| 24 | 699072 |
| 25 | 671092 |
| 26 | 0 |
| 27 | 2485534 |
| 28 | 9586984 |
| 29 | 9256396 |
| 30 | 0 |
| 31 | 34636834 |
| 32 | 134217728 |
| 33 | 130150588 |
| 34 | 0 |
| 35 | 490853416 |
| 36 | 1908874584 |
| 37 | 1857283156 |
| 38 | 0 |
| 39 | 7048151672 |
| 40 | 27487790720 |