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A147903 as a simple table

na(n)
11
22
36
424
596
6456
72134
811650
974546
10530962
113437002
1224793292
13214741200
142028628716
1517460401888
16162168439452

[1,2,6,24,96,456,2134,11650,74546,530962,3437002,
 24793292,214741200,2028628716,17460401888,
 162168439452]