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A001187 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 38 |
| 5 | 728 |
| 6 | 26704 |
| 7 | 1866256 |
| 8 | 251548592 |
| 9 | 66296291072 |
| 10 | 34496488594816 |
| 11 | 35641657548953344 |
| 12 | 73354596206766622208 |
| 13 | 301272202649664088951808 |
| 14 | 2471648811030443735290891264 |
| 15 | 40527680937730480234609755344896 |
| 16 | 1328578958335783201008338986845427712 |
[1,1,1,4,38,728,26704,1866256,251548592, 66296291072,34496488594816,35641657548953344, 73354596206766622208,301272202649664088951808, 2471648811030443735290891264, 40527680937730480234609755344896, 1328578958335783201008338986845427712] |