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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 114 |
| 3 | 924 |
| 4 | 6539 |
| 5 | 39528 |
| 6 | 199926 |
| 7 | 806136 |
| 8 | 2761740 |
| 9 | 8656152 |
| 10 | 22334112 |
| 11 | 32420448 |
| 12 | 18780864 |
| 13 | 2166720 |
| 14 | 6624 |
[1,12,114,924,6539,39528,199926,806136,2761740, 8656152,22334112,32420448,18780864,2166720,6624] |