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A181344 as a simple table
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 5 |
| 6 | 25 |
| 7 | 161 |
| 8 | 1112 |
| 9 | 8787 |
| 10 | 76156 |
| 11 | 728699 |
| 12 | 7609065 |
| 13 | 86162795 |
| 14 | 1050755884 |
| 15 | 13728407061 |
| 16 | 191309852944 |
[0,0,1,1,5,25,161,1112,8787,76156,728699,7609065, 86162795,1050755884,13728407061,191309852944] |