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A215873 as a simple table

na(n)
11
21
31
44
520
6189
71642
826451
9307874
107027942
1198057806
122850280812
1344974137856

[1,1,1,4,20,189,1642,26451,307874,7027942,
 98057806,2850280812,44974137856]