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A053531 as a simple table

na(n)
01
10
20
30
41
515
672
7420
82915
924570
10245070
112633400
1230588783
13383841315
145197243590
1575666140550
161177491151785
1719496256883740
18342184849138188
196346249258076280
20124023565540658025
212547445128977720475
2254865546632888272820

[1,0,0,0,1,15,72,420,2915,24570,245070,2633400,
 30588783,383841315,5197243590,75666140550,
 1177491151785,19496256883740,342184849138188,
 6346249258076280,124023565540658025,
 2547445128977720475,54865546632888272820]