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A147726 as a simple table

na(n)
11
22
36
416
554
6232
7936
83880
917302
1081584
11425550
122332858
1313639774
1484416970
15555549406
163834425860
1727937916790

[1,2,6,16,54,232,936,3880,17302,81584,425550,
 2332858,13639774,84416970,555549406,3834425860,
 27937916790]