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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 632 |
| 4 | 28784 |
| 5 | 1991552 |
| 6 | 193410624 |
| 7 | 24993180032 |
| 8 | 4134783110144 |
| 9 | 850499728758272 |
| 10 | 212579274719007744 |
| 11 | 63381008507902595072 |
| 12 | 22200896917210834817024 |
| 13 | 9019985888570141052280832 |
| 14 | 4204783981520054371872374784 |
| 15 | 2228007853953954434037178007552 |
[1,2,24,632,28784,1991552,193410624,24993180032, 4134783110144,850499728758272,212579274719007744, 63381008507902595072,22200896917210834817024, 9019985888570141052280832, 4204783981520054371872374784, 2228007853953954434037178007552] |