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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 2911 |
| 3 | 7997214 |
| 4 | 57641556673 |
| 5 | 867583274883920 |
| 6 | 23630375698358890319 |
| 7 | 1056918444955456528983706 |
| 8 | 72383076947075470731692782081 |
| 9 | 7200266529428094485775774835670652 |
| 10 | 998383804974887102441600687728515247999 |
| 11 | 186701261436825568741051032736345268517903734 |
[1,4,2911,7997214,57641556673,867583274883920, 23630375698358890319,1056918444955456528983706, 72383076947075470731692782081, 7200266529428094485775774835670652, 998383804974887102441600687728515247999, 186701261436825568741051032736345268517903734] |