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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 142 |
| 3 | 1664 |
| 4 | 19364 |
| 5 | 224208 |
| 6 | 2586488 |
| 7 | 29757376 |
| 8 | 341671696 |
| 9 | 3917211072 |
| 10 | 44860395232 |
| 11 | 513321219584 |
| 12 | 5870105658944 |
| 13 | 67096633659648 |
| 14 | 766662318616448 |
| 15 | 8757776273683456 |
| 16 | 100022618249257216 |
| 17 | 1142190290164165632 |
[1,12,142,1664,19364,224208,2586488,29757376, 341671696,3917211072,44860395232,513321219584, 5870105658944,67096633659648,766662318616448, 8757776273683456,100022618249257216, 1142190290164165632] |