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A339294 as a simple table

na(n)
10
21
31
42
55
613
735
8101
9299
10916
112859
129087
1329247
1495188
15312490
161033715
173441280
1811520726
1938758234
20130962986
21444251957
221512321767
235164750890
2417689837577
2560752024243
26209154519704
27721707099632
282495565928527
298646220929912
3030010588561120

[0,1,1,2,5,13,35,101,299,916,2859,9087,29247,
 95188,312490,1033715,3441280,11520726,38758234,
 130962986,444251957,1512321767,5164750890,
 17689837577,60752024243,209154519704,721707099632,
 2495565928527,8646220929912,30010588561120]