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A123941 as a simple table

na(n)
00
11
23
39
426
575
6216
7622
81791
95157
1014849
1142756
12123111
13354484
141020696
152938977
168462447
1724366645
1870160958
19202020427
20581694636
211674922950
224822748423
2313886550633
2439984728949
25115131438424
26331507764639
27954538564968
282748484256480

[0,1,3,9,26,75,216,622,1791,5157,14849,42756,
 123111,354484,1020696,2938977,8462447,24366645,
 70160958,202020427,581694636,1674922950,
 4822748423,13886550633,39984728949,115131438424,
 331507764639,954538564968,2748484256480]