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A147949 as a simple table

na(n)
11
22
36
416
554
6232
7936
85070
925700
10139976
11795314
124513652
1326295578
14160997802
151236858656
169227571868

[1,2,6,16,54,232,936,5070,25700,139976,795314,
 4513652,26295578,160997802,1236858656,9227571868]