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A133326 as a simple table

na(n)
12
28
320
450
5118
6292
7688
81702
94010
109920
1123372
1257818
13136222
14336988
15793960
161964110
174627538
1811447672
1926971268
2066721922
21157200070
22388883860
23916229152
242266581238
255340174842
2613210603568
2731124819900
2876997040170
29181408744558
30448771637452

[2,8,20,50,118,292,688,1702,4010,9920,23372,57818,
 136222,336988,793960,1964110,4627538,11447672,
 26971268,66721922,157200070,388883860,916229152,
 2266581238,5340174842,13210603568,31124819900,
 76997040170,181408744558,448771637452]