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A181547 as a simple table

na(n)
01
11
22
333
4245
51268
610903
7108801
8876184
97319995
1070550669
11663827604
126051592703
1357695451167
14563736086740
155452227384417
1653094611797387
17525962074892014
185232943624317191
1952145361057635835
20523458523860890906

[1,1,2,33,245,1268,10903,108801,876184,7319995,
 70550669,663827604,6051592703,57695451167,
 563736086740,5452227384417,53094611797387,
 525962074892014,5232943624317191,
 52145361057635835,523458523860890906]