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A221572 as a simple table

na(n)
10
250
3314
42500
519014
6145800
71116400
88550512
965485386
10501533796
113841097940
1229417832750
13225302467392
141725524876860
1513215284016064
16101211946587176
17775152325067630
185936662096954472
1945467136862793520

[0,50,314,2500,19014,145800,1116400,8550512,
 65485386,501533796,3841097940,29417832750,
 225302467392,1725524876860,13215284016064,
 101211946587176,775152325067630,5936662096954472,
 45467136862793520]