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A007499 as a simple table

na(n)
12
23
34
412
520
655
7127
8371
91037
103249
1110071
1232913
13108112
14363618
151233938
164244102
1714716095
1851480027
19181312939

[2,3,4,12,20,55,127,371,1037,3249,10071,32913,
 108112,363618,1233938,4244102,14716095,51480027,
 181312939]