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A027912 as a simple table

na(n)
21
35
428
5156
6880
75005
828665
9165104
10955434
115550755
1232355917
13189147400
141108476720
156510243495
1638308997100
17225810489168
181333057076890

[1,5,28,156,880,5005,28665,165104,955434,5550755,
 32355917,189147400,1108476720,6510243495,
 38308997100,225810489168,1333057076890]