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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 58 |
| 4 | 1208 |
| 5 | 39476 |
| 6 | 1861372 |
| 7 | 119587224 |
| 8 | 10040970816 |
| 9 | 1067383279872 |
| 10 | 140110136642304 |
| 11 | 22256626639796352 |
| 12 | 4207858001708629248 |
| 13 | 933704296260740939520 |
| 14 | 240293228328619963492608 |
| 15 | 70992050129486593239246336 |
| 16 | 23863916105454465092261412864 |
[1,1,5,58,1208,39476,1861372,119587224, 10040970816,1067383279872,140110136642304, 22256626639796352,4207858001708629248, 933704296260740939520,240293228328619963492608, 70992050129486593239246336, 23863916105454465092261412864] |