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A090032 as a simple table

na(n)
01
12
24
310
426
566
6171
7440
81112
92786
106820
1116720
1241106
13100856
14245793
15597030
161441292
173469486
188304526
1919832076
2047110238
21111669014

[1,2,4,10,26,66,171,440,1112,2786,6820,16720,
 41106,100856,245793,597030,1441292,3469486,
 8304526,19832076,47110238,111669014]