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A090576 as a simple table

na(n)
01
14
212
340
4128
5412
61251
74026
812362
939624
10120012
11379132
121130914
133530916
1410402781
1532112656
1693427431

[1,4,12,40,128,412,1251,4026,12362,39624,120012,
 379132,1130914,3530916,10402781,32112656,93427431]