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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 26 |
| 4 | 202 |
| 5 | 1601 |
| 6 | 13069 |
| 7 | 110776 |
| 8 | 960085 |
| 9 | 8474021 |
| 10 | 75841922 |
| 11 | 686340737 |
| 12 | 6267984796 |
| 13 | 57677570801 |
| 14 | 534156825708 |
[0,3,26,202,1601,13069,110776,960085,8474021, 75841922,686340737,6267984796,57677570801, 534156825708] |