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A225178 as a simple table

na(n)
11
22
36
416
548
6140
7408
81224
93640
1010824
1132192
1296576
13288912
14864288
152585584
167735104
1723205312
1869551552
19208461504
20624806688
211872691488
225612903296
2316838709888
2450500659456
25151455567744
26454227600128
271362265877376

[1,2,6,16,48,140,408,1224,3640,10824,32192,96576,
 288912,864288,2585584,7735104,23205312,69551552,
 208461504,624806688,1872691488,5612903296,
 16838709888,50500659456,151455567744,454227600128,
 1362265877376]