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A153926 as a simple table

na(n)
01
12
22
33
45
56
612
735
883
9231
10918
112132
127575
1342734
14132320
15609928
164694085
1718109624
18113969565
191148801096
206065910343
2151213901318

[1,2,2,3,5,6,12,35,83,231,918,2132,7575,42734,
 132320,609928,4694085,18109624,113969565,
 1148801096,6065910343,51213901318]