A005967 - OEIS

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A005967 as a simple table

n	a(n)
1	2
2	5
3	17
4	71
5	388
6	2592
7	21096
8	204638
9	2317172
10	30024276
11	437469859
12	7067109598
13	125184509147
14	2410455693765
15	50101933643655
16	1117669367609605
17	26629298567576331
18	674793598023809924
19	18119844622209998036

[2,5,17,71,388,2592,21096,204638,2317172,30024276, 437469859,7067109598,125184509147,2410455693765, 50101933643655,1117669367609605,26629298567576331, 674793598023809924,18119844622209998036]