A185063 - OEIS

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A185063 as a simple table

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	1
15	1
16	5
17	25
18	297
19	8199
20	377004
21	22014143
22	1493574756
23	114880777582
24	9919463450854

[0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,5,25,297,8199, 377004,22014143,1493574756,114880777582, 9919463450854]