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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 1316 |
| 4 | 840124672 |
| 5 | 6110726696100443604557936 |
| 6 | 439451426203104201222708341688051362423089952907263634936946272224 |
[0,1,10,1316,840124672,6110726696100443604557936, 43945142620310420122270834168805136242308995290726\ 3634936946272224] |