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A284838 as a simple table

na(n)
10
240
31088
421888
5397312
66883328
7116244480
81932230656
931778668544
10518791888896
118424565768192
12136279337467904
132198302774788096
1435386835907641344
15568757233463066624
169130929873047519232
17146464646890277306368
182347871574175904694272

[0,40,1088,21888,397312,6883328,116244480,
 1932230656,31778668544,518791888896,8424565768192,
 136279337467904,2198302774788096,
 35386835907641344,568757233463066624,
 9130929873047519232,146464646890277306368,
 2347871574175904694272]