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A147728 as a simple table

na(n)
11
22
36
416
554
6232
7936
83880
917302
1081584
11409012
122138674
1311754832
1466857094
15399774882
162469567300
1715804526682

[1,2,6,16,54,232,936,3880,17302,81584,409012,
 2138674,11754832,66857094,399774882,2469567300,
 15804526682]