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A243771 as a simple table

na(n)
21
31
42
512
669
798
8180
91056
103967
1118357
1277685
13264563
141245762
151915056
165303208
1724548040
18107835695
19375494210
201898502240
214942470942
2223489565822
23104559681798
24413327570240
251426320927138
266025235528016
2719911812844324
2887316285518504

[1,1,2,12,69,98,180,1056,3967,18357,77685,264563,
 1245762,1915056,5303208,24548040,107835695,
 375494210,1898502240,4942470942,23489565822,
 104559681798,413327570240,1426320927138,
 6025235528016,19911812844324,87316285518504]