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A368972 as a simple table

na(n)
01
13
215
388
4564
53819
626851
7194025
81431498
910735548
1081580008
11626697786
124858272450
1337954323885
14298487957670
152361025981335
1618770449480056
17149897172319290
181201831832357041
199670416882346848
2078062823843714528
21631988009034161246

[1,3,15,88,564,3819,26851,194025,1431498,10735548,
 81580008,626697786,4858272450,37954323885,
 298487957670,2361025981335,18770449480056,
 149897172319290,1201831832357041,9670416882346848,
 78062823843714528,631988009034161246]