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 | 0 |
| 3 | 24 |
| 4 | 286 |
| 5 | 0 |
| 6 | 0 |
| 7 | 30272 |
| 8 | 127380 |
| 9 | 0 |
| 10 | 0 |
| 11 | 3704712 |
| 12 | 9193560 |
| 13 | 0 |
| 14 | 0 |
| 15 | 95466432 |
| 16 | 188158878 |
| 17 | 0 |
| 18 | 0 |
| 19 | 1143602504 |
| 20 | 1960071240 |
| 21 | 0 |
| 22 | 0 |
| 23 | 8506291008 |
| 24 | 13291711752 |
| 25 | 0 |
| 26 | 0 |
| 27 | 45759480032 |
| 28 | 67076333632 |
| 29 | 0 |
| 30 | 0 |
| 31 | 195398854272 |
| 32 | 272568823956 |
| 33 | 0 |
| 34 | 0 |