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A074651 as a simple table

na(n)
16
242
3558
48640
5151350
62858562
757010422
81183184640
925319269980
10555099603450
1112411545042094
12282060978777792
136498315236374338
14151469476107975354
153566331985691591550
1684709091524784348160

[6,42,558,8640,151350,2858562,57010422,1183184640,
 25319269980,555099603450,12411545042094,
 282060978777792,6498315236374338,
 151469476107975354,3566331985691591550,
 84709091524784348160]