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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 32 |
| 4 | 736 |
| 5 | 47600 |
| 6 | 9901728 |
| 7 | 6780161344 |
| 8 | 15819971230848 |
| 9 | 128391245362464512 |
| 10 | 3685238521747987153664 |
| 11 | 378871127417706380405937152 |
| 12 | 140962622184196263047081802452992 |
| 13 | 191428155805533938524028481989647915008 |
[1,1,4,32,736,47600,9901728,6780161344, 15819971230848,128391245362464512, 3685238521747987153664, 378871127417706380405937152, 140962622184196263047081802452992, 191428155805533938524028481989647915008] |