A189565 - OEIS

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A189565 as a simple table

n	a(n)
0	1
1	1
2	2
3	6
4	12
5	36
6	174
7	708
8	4334
9	31424
10	263732
11	2503296
12	26844578
13	316692056
14	4090634212
15	57274447458
16	863488976620

[1,1,2,6,12,36,174,708,4334,31424,263732,2503296, 26844578,316692056,4090634212,57274447458, 863488976620]

[1,1,2,6,12,36,174,708,4334,31424,263732,2503296,
 26844578,316692056,4090634212,57274447458,
 863488976620]