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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 147 |
| 3 | 746 |
| 4 | 7943 |
| 5 | 50994 |
| 6 | 367390 |
| 7 | 2840132 |
| 8 | 26703908 |
| 9 | 234458622 |
| 10 | 2153468514 |
[0,147,746,7943,50994,367390,2840132,26703908, 234458622,2153468514] |