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A075878 as a simple table

na(n)
04
140
2544
38320
4131584
52099200
633562624
7536903680
88590065664
9137439477760
102199025352704
1135184380477440

[4,40,544,8320,131584,2099200,33562624,536903680,
 8590065664,137439477760,2199025352704,
 35184380477440]