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A326131 as a simple table

na(n)
16
228
3110
4496
5884
68128
718632
885936
9116624
1015370304
1133550336
1273995392
13815634435
143915380170
155556840416
166800695312
178589869056

[6,28,110,496,884,8128,18632,85936,116624,
 15370304,33550336,73995392,815634435,3915380170,
 5556840416,6800695312,8589869056]