A266468 - OEIS

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A266468 as a simple table

n	a(n)
1	2
2	8
3	39
4	261
5	2090
6	18808
7	175180
8	1595005
9	13720886
10	109830369
11	814603355
12	5605474331
13	35922351069
14	215377645103
15	1213816837380
16	6458765687442
17	32580784869691
18	156385330035183
19	716642920656832

[2,8,39,261,2090,18808,175180,1595005,13720886, 109830369,814603355,5605474331,35922351069, 215377645103,1213816837380,6458765687442, 32580784869691,156385330035183,716642920656832]