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A147917 as a simple table

na(n)
11
22
36
424
574
6368
72140
811468
978848
10636700
114866484
1243893944
13452631554
144475626268
1550128776656
16625960035472

[1,2,6,24,74,368,2140,11468,78848,636700,4866484,
 43893944,452631554,4475626268,50128776656,
 625960035472]