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A081039 as a simple table

na(n)
01
17
240
3208
41024
54864
622528
7102400
8458752
92031616
108912896
1138797312
12167772160
13721420288
143087007744
1513153337344
1655834574848
17236223201280
18996432412672
194191888080896
2017592186044416
2173667279060992

[1,7,40,208,1024,4864,22528,102400,458752,2031616,
 8912896,38797312,167772160,721420288,3087007744,
 13153337344,55834574848,236223201280,996432412672,
 4191888080896,17592186044416,73667279060992]