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A154636 as a simple table

na(n)
01
12
218
3138
41050
57986
660738
7461946
83513354
926720994
10203227890
111545660138
1211755597434
1389407799058
14679995600162
155171741404122
1639333944432490
17299156331247554
182275248816682962
1917304521539721034
20131610425867719386
211000969842322591986

[1,2,18,138,1050,7986,60738,461946,3513354,
 26720994,203227890,1545660138,11755597434,
 89407799058,679995600162,5171741404122,
 39333944432490,299156331247554,2275248816682962,
 17304521539721034,131610425867719386,
 1000969842322591986]