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A147913 as a simple table

na(n)
11
22
36
416
554
6232
71194
85348
928874
10153508
11823908
124528784
1331785252
14218092306
151562069462
1611268454920

[1,2,6,16,54,232,1194,5348,28874,153508,823908,
 4528784,31785252,218092306,1562069462,11268454920]