A186745 - OEIS

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A186745 as a simple table

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	0
7	0
8	0
9	0
10	1
11	0
12	2
13	0
14	8
15	0
16	48
17	0
18	450
19	1
20	5753
21	8
22	90684
23	3917
24	1736764
25	4131991
26	163457964
27	4018022149
28	119021971348

[0,0,0,0,0,1,0,0,0,0,1,0,2,0,8,0,48,0,450,1,5753, 8,90684,3917,1736764,4131991,163457964,4018022149, 119021971348]