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A147916 as a simple table

na(n)
11
22
36
416
554
6232
7936
83880
923002
10127008
11720116
124318818
1326024362
14158973744
151022131470
166808137758

[1,2,6,16,54,232,936,3880,23002,127008,720116,
 4318818,26024362,158973744,1022131470,6808137758]