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A143314 as a simple table

na(n)
10
20
30
40
540
61844
741584
8611340
96588116
1055482100
11380126920
122177910310
1310644616240
1445049914588
15167011924492
16547315800984
171597026077496
184173458163098
199813490226056
2020841357619302
2140096048882028

[0,0,0,0,40,1844,41584,611340,6588116,55482100,
 380126920,2177910310,10644616240,45049914588,
 167011924492,547315800984,1597026077496,
 4173458163098,9813490226056,20841357619302,
 40096048882028]