A002885 - OEIS

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A002885 as a simple table

n	a(n)
0	1
1	1
2	0
3	1
4	0
5	0
6	1
7	2
8	0
9	4
10	7
11	0
12	12
13	8
14	0
15	80
16	84
17	0
18	820
19	798
20	0
21	9508
22	11616
23	0
24	157340
25	139828
26	0
27	3027456
28	2353310

[1,1,0,1,0,0,1,2,0,4,7,0,12,8,0,80,84,0,820,798,0, 9508,11616,0,157340,139828,0,3027456,2353310]