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A219146 as a simple table

na(n)
11
2142
31400
411385
5101600
6872437
77640541
866900727
9587994968
105165646362
1145386314917
12398705236904
133502774773711
1430774842966797

[1,142,1400,11385,101600,872437,7640541,66900727,
 587994968,5165646362,45386314917,398705236904,
 3502774773711,30774842966797]