A107104 - OEIS

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A107104 as a simple table

n	a(n)
0	1
1	2
2	6
3	26
4	154
5	1182
6	11254
7	128522
8	1715802
9	26251118
10	453132214
11	8714516538
12	184817376154
13	4285657717694
14	107880712446966
15	2929921866938858
16	85399256991014746
17	2659096654189212558
18	88091786616208073398

[1,2,6,26,154,1182,11254,128522,1715802,26251118, 453132214,8714516538,184817376154,4285657717694, 107880712446966,2929921866938858, 85399256991014746,2659096654189212558, 88091786616208073398]