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A365588 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 55 |
| 3 | 910 |
| 4 | 20080 |
| 5 | 553870 |
| 6 | 18333050 |
| 7 | 707959800 |
| 8 | 31244562600 |
| 9 | 1551289408800 |
| 10 | 85579293493200 |
| 11 | 5193226343508000 |
| 12 | 343790892166398000 |
| 13 | 24655487205067386000 |
| 14 | 1904221630155352038000 |
| 15 | 157574022827034258192000 |
| 16 | 13908505761692419540320000 |
[1,5,55,910,20080,553870,18333050,707959800, 31244562600,1551289408800,85579293493200, 5193226343508000,343790892166398000, 24655487205067386000,1904221630155352038000, 157574022827034258192000, 13908505761692419540320000] |