A184945 - OEIS

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A184945 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	0
15	0
16	0
17	0
18	0
19	1
20	2
21	8
22	131
23	3917
24	123859
25	4131991
26	132160607
27	4018022149
28	118369811959

[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,2,8,131, 3917,123859,4131991,132160607,4018022149, 118369811959]