A177382 - OEIS

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A177382 as a simple table

n	a(n)
0	1
1	1
2	4
3	38
4	656
5	17776
6	695104
7	37049648
8	2581673216
9	227817246976
10	24829660693504
11	3275474443371008
12	514345822537650176
13	94806411271686270976
14	20269838348763427323904
15	4975513260049237751994368

[1,1,4,38,656,17776,695104,37049648,2581673216, 227817246976,24829660693504,3275474443371008, 514345822537650176,94806411271686270976, 20269838348763427323904,4975513260049237751994368]