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A172227 as a simple table

na(n)
10
20
36
4405
55024
631320
7133544
8446421
91258590
103126724
117042930
1214669709
1328658436
1453069000
1593909924
16159819965
17262913874
18419816676
19652912510
20991835749
211475233800
222152832664
233087838016
244359706245
256067321574
268332617060
2711304678954

[0,0,6,405,5024,31320,133544,446421,1258590,
 3126724,7042930,14669709,28658436,53069000,
 93909924,159819965,262913874,419816676,652912510,
 991835749,1475233800,2152832664,3087838016,
 4359706245,6067321574,8332617060,11304678954]