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A012321 as a simple table

na(n)
00
11
22
35
420
5125
6830
76001
845768
9394553
103699418
1138758909
12433324828
135299232757
1468428221654
15958395448297
1614101599762448
17223667919165041
183706771205012274
1965843651814440309
201215858569345385636

[0,1,2,5,20,125,830,6001,45768,394553,3699418,
 38758909,433324828,5299232757,68428221654,
 958395448297,14101599762448,223667919165041,
 3706771205012274,65843651814440309,
 1215858569345385636]