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A093974 as a simple table

na(n)
10
20
30
40
528
6424
75318
860761
9648780
106576432
1164778166
12626694626
135994718578
1456938020205
15538418118750
165078038454782
1747824516913862
18450132198653881

[0,0,0,0,28,424,5318,60761,648780,6576432,
 64778166,626694626,5994718578,56938020205,
 538418118750,5078038454782,47824516913862,
 450132198653881]