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A145545 as a simple table

na(n)
11
21
32
44
59
620
748
8115
9285
10715
111826
124711
1312303
1432387
1585964
16229662
17617300
181667787
194527290
2012340688
2133766612
2292707834
23255329106

[1,1,2,4,9,20,48,115,285,715,1826,4711,12303,
 32387,85964,229662,617300,1667787,4527290,
 12340688,33766612,92707834,255329106]