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A001303 as a simple table

na(n)
16
250
3225
4735
51960
64536
79450
818150
932670
1055770
1191091
12143325
13218400
14323680
15468180
16662796
17920550
181256850
191689765
202240315
212932776
223795000
234858750
246160050
257739550
269642906
2711921175
2814631225
2917836160
3021605760
3126016936
3231154200

[6,50,225,735,1960,4536,9450,18150,32670,55770,
 91091,143325,218400,323680,468180,662796,920550,
 1256850,1689765,2240315,2932776,3795000,4858750,
 6160050,7739550,9642906,11921175,14631225,
 17836160,21605760,26016936,31154200]