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A138356 as a simple table

na(n)
01
11
22
34
410
527
682
7268
8940
93476
1013448
1153968
12223412
13949535
144128594
1518310972
1682645012
17378851428
181760998280
198288679056
2039457907128
21189784872428
22921472827272
234512940614960
2422279014978544
25110797225212112

[1,1,2,4,10,27,82,268,940,3476,13448,53968,223412,
 949535,4128594,18310972,82645012,378851428,
 1760998280,8288679056,39457907128,189784872428,
 921472827272,4512940614960,22279014978544,
 110797225212112]