A321468 - OEIS

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A321468 as a simple table

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	2
6	4
7	4
8	10
9	20
10	40
11	40
12	116
13	116
14	232
15	464
16	1440
17	1440
18	4192
19	4192
20	11640
21	23280
22	46560
23	46560
24	157376

[1,1,1,1,2,2,4,4,10,20,40,40,116,116,232,464,1440, 1440,4192,4192,11640,23280,46560,46560,157376]