A103367 - OEIS

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A103367 as a simple table

n	a(n)
2	1
3	2
4	6
5	26
6	160
7	1372
8	15974
9	245142
10	4817712
11	118198568
12	3542890648
13	127417949496
14	5415490994368
15	268526379444104
16	15363229400769566
17	1004545432884250126
18	74441340170270921952
19	6205992783298302119536

[1,2,6,26,160,1372,15974,245142,4817712,118198568, 3542890648,127417949496,5415490994368, 268526379444104,15363229400769566, 1004545432884250126,74441340170270921952, 6205992783298302119536]