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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 202 |
| 4 | 163692 |
| 5 | 2487100956 |
| 6 | 832252747110528 |
| 7 | 7116720347983770858600 |
| 8 | 1776529280247277318394451118272 |
| 9 | 14580103976468323893693256154922439405632 |
| 10 | 4377460729080839690885111988468699720430287682744896 |
| 11 | 52959485251272238069446517666752040946228209263610778166878160384 |
[1,1,4,202,163692,2487100956,832252747110528, 7116720347983770858600, 1776529280247277318394451118272, 14580103976468323893693256154922439405632, 43774607290808396908851119884686997204302876827448\ 96, 52959485251272238069446517666752040946228209263610\ 778166878160384] |