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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 11 |
| 6 | 74 |
| 7 | 1232 |
| 8 | 108084 |
| 9 | 141466347 |
| 10 | 15464951390151 |
| 11 | 2189441739723579832963 |
| 12 | 33859919808724254529558716855414396 |
| 13 | 74134322256556148244446056491575979484293791968668948464 |
[0,0,1,3,11,74,1232,108084,141466347, 15464951390151,2189441739723579832963, 33859919808724254529558716855414396, 74134322256556148244446056491575979484293791968668\ 948464] |