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A215071 as a simple table

na(n)
11
21
32
44
512
639
7138
8503
91864
106936
1125868
1296512
13360203
141344408
155018051
1618729944
1769910398
18260943079
19973980990
203635421345
2113569354266
2250648137765
23189046143161

[1,1,2,4,12,39,138,503,1864,6936,25868,96512,
 360203,1344408,5018051,18729944,69910398,
 260943079,973980990,3635421345,13569354266,
 50648137765,189046143161]