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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 201 |
| 4 | 6216 |
| 5 | 261300 |
| 6 | 13923762 |
| 7 | 899679144 |
| 8 | 68368215528 |
| 9 | 5975493315264 |
| 10 | 590584798045440 |
| 11 | 65132133511182408 |
| 12 | 7929604511136220536 |
| 13 | 1056369806709005923992 |
| 14 | 152854816585283562807288 |
| 15 | 23873492748049623945947160 |
| 16 | 4002988479012229417182249408 |
[1,1,10,201,6216,261300,13923762,899679144, 68368215528,5975493315264,590584798045440, 65132133511182408,7929604511136220536, 1056369806709005923992,152854816585283562807288, 23873492748049623945947160, 4002988479012229417182249408] |