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A243321 as a simple table

na(n)
11
21
31
43
55
616
741
8158
9582
102749
1113852
1280341
13503582
143419670
1524533162
16184227017

[1,1,1,3,5,16,41,158,582,2749,13852,80341,503582,
 3419670,24533162,184227017]