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A215072 as a simple table

na(n)
11
21
32
44
512
640
7153
8638
92825
1012938
1160458
12285664
131358283
146480694
1530979999
16148249768
17709832688
183399805736
1916286469156
2078026226228
21373832145200
221791120945112

[1,1,2,4,12,40,153,638,2825,12938,60458,285664,
 1358283,6480694,30979999,148249768,709832688,
 3399805736,16286469156,78026226228,373832145200,
 1791120945112]