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A143877 as a simple table

na(n)
01
12
21
37
44
555
617
7576
8129
913243
101554
11465675
1235443
1332233206
141330673
153746034675
1692945020

[1,2,1,7,4,55,17,576,129,13243,1554,465675,35443,
 32233206,1330673,3746034675,92945020]