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 | 20 |
| 4 | 246 |
| 5 | 0 |
| 6 | 0 |
| 7 | 30624 |
| 8 | 127908 |
| 9 | 0 |
| 10 | 0 |
| 11 | 3699612 |
| 12 | 9190616 |
| 13 | 0 |
| 14 | 0 |
| 15 | 95498592 |
| 16 | 188170398 |
| 17 | 0 |
| 18 | 0 |
| 19 | 1143506364 |
| 20 | 1960018920 |
| 21 | 0 |
| 22 | 0 |
| 23 | 8506347552 |
| 24 | 13291928232 |
| 25 | 0 |
| 26 | 0 |
| 27 | 45759995408 |
| 28 | 67075871808 |
| 29 | 0 |
| 30 | 0 |
| 31 | 195397296192 |
| 32 | 272568671892 |
| 33 | 0 |
| 34 | 0 |