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A242275 as a simple table

na(n)
11
21
32
45
515
655
7246
81398
910301
1098532
111246479
1220837171
13466087624
1413943041873
15563753074915
1630784745506212

[1,1,2,5,15,55,246,1398,10301,98532,1246479,
 20837171,466087624,13943041873,563753074915,
 30784745506212]