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A143878 as a simple table

na(n)
01
12
25
317
492
5581
64989
754250
8776877
914503255
10356467268
1111553201879
12495106836021

[1,2,5,17,92,581,4989,54250,776877,14503255,
 356467268,11553201879,495106836021]