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A147922 as a simple table

na(n)
11
22
36
416
554
6232
71132
87628
950462
10382076
112944618
1224671640
13216525368
142053251888
1523564654276
16271943000896

[1,2,6,16,54,232,1132,7628,50462,382076,2944618,
 24671640,216525368,2053251888,23564654276,
 271943000896]