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A147727 as a simple table

na(n)
11
22
36
416
554
6232
7936
83880
917302
1081584
11409012
122169742
1311998726
1469653068
15426511054
162718410098
1718114464012

[1,2,6,16,54,232,936,3880,17302,81584,409012,
 2169742,11998726,69653068,426511054,2718410098,
 18114464012]