A233565 - OEIS

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A233565 as a simple table

n	a(n)
0	0
1	0
2	0
3	1
4	2
5	5
6	5
7	7
8	7
9	5
10	5
11	11
12	11
13	91
14	91
15	-9
16	-9
17	1207
18	1207
19	-10849
20	-10849
21	65879
22	65879
23	-783127
24	-783127
25	61098739
26	61098739
27	-2034290233
28	-2034290233
29	72986324461
30	72986324461

[0,0,0,1,2,5,5,7,7,5,5,11,11,91,91,-9,-9,1207, 1207,-10849,-10849,65879,65879,-783127,-783127, 61098739,61098739,-2034290233,-2034290233, 72986324461,72986324461]