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A290438 as a simple table

na(n)
11
21
33
43
512
620
739
864
9116
10210
11438
12966
132089
144155
158032
1615657
1730325
1858379
19112885

[1,1,3,3,12,20,39,64,116,210,438,966,2089,4155,
 8032,15657,30325,58379,112885]