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 | 1 |
| 3 | 0 |
| 4 | 2 |
| 5 | 24 |
| 6 | 0 |
| 7 | 5 |
| 8 | 176 |
| 9 | 1539 |
| 10 | 0 |
| 11 | 15 |
| 12 | 1504 |
| 13 | 25029 |
| 14 | 193536 |
| 15 | 0 |
| 16 | 52 |
| 17 | 14528 |
| 18 | 453438 |
| 19 | 5558272 |
| 20 | 40250000 |
| 21 | 0 |
| 22 | 203 |
| 23 | 155520 |
| 24 | 9003879 |
| 25 | 173490176 |
| 26 | 1799296875 |
| 27 | 12508380288 |
| 28 | 0 |
| 29 | 877 |
| 30 | 1819392 |
| 31 | 193687281 |
| 32 | 5826740224 |
| 33 | 86070703125 |
| 34 | 803204128512 |
| 35 | 5430309951577 |