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 | 0 |
| 5 | 6 |
| 6 | 6 |
| 7 | 0 |
| 8 | 38 |
| 9 | 84 |
| 10 | 24 |
| 11 | 0 |
| 12 | 390 |
| 13 | 1710 |
| 14 | 840 |
| 15 | 120 |
| 16 | 0 |
| 17 | 6062 |
| 18 | 49740 |
| 19 | 36840 |
| 20 | 8280 |
| 21 | 720 |
| 22 | 0 |
| 23 | 134526 |
| 24 | 2050566 |
| 25 | 2184000 |
| 26 | 646800 |
| 27 | 85680 |
| 28 | 5040 |
| 29 | 0 |
| 30 | 4172198 |
| 31 | 118645044 |
| 32 | 177549624 |
| 33 | 65313360 |
| 34 | 10735200 |
| 35 | 947520 |
| 36 | 40320 |