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A047929 as a simple table

na(n)
20
318
496
5300
6720
71470
82688
94536
107200
1110890
1215840
1322308
1430576
1540950
1653760
1769360
1888128
19110466
20136800
21167580
22203280
23244398
24291456
25345000
26405600
27473850
28550368
29635796
30730800
31836070
32952320
331080288
341220736

[0,18,96,300,720,1470,2688,4536,7200,10890,15840,
 22308,30576,40950,53760,69360,88128,110466,136800,
 167580,203280,244398,291456,345000,405600,473850,
 550368,635796,730800,836070,952320,1080288,
 1220736]