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 | 32 |
| 4 | 366 |
| 5 | 0 |
| 6 | 0 |
| 7 | 29568 |
| 8 | 126324 |
| 9 | 0 |
| 10 | 0 |
| 11 | 3714912 |
| 12 | 9199448 |
| 13 | 0 |
| 14 | 0 |
| 15 | 95402112 |
| 16 | 188135838 |
| 17 | 0 |
| 18 | 0 |
| 19 | 1143794784 |
| 20 | 1960175880 |
| 21 | 0 |
| 22 | 0 |
| 23 | 8506177920 |
| 24 | 13291278792 |
| 25 | 0 |
| 26 | 0 |
| 27 | 45758449280 |
| 28 | 67077257280 |
| 29 | 0 |
| 30 | 0 |
| 31 | 195401970432 |
| 32 | 272569128084 |
| 33 | 0 |
| 34 | 0 |