A332752 - OEIS

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A332752 as a simple table

n	a(n)
0	1
1	1
2	4
3	16
4	110
5	544
6	5444
7	32520
8	385776
9	3282108
10	40916528
11	354328560
12	7200045216
13	67347823160
14	1182323197504
15	18086875471594
16	358787259407482
17	4564034487662420

[1,1,4,16,110,544,5444,32520,385776,3282108, 40916528,354328560,7200045216,67347823160, 1182323197504,18086875471594,358787259407482, 4564034487662420]