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A057507 as a simple table

na(n)
01
11
21
32
43
510
618
746
895
9236
10528
111288
122936
136984
1416212
1538528
1690717
17216648
18516358
191240818
202979992

[1,1,1,2,3,10,18,46,95,236,528,1288,2936,6984,
 16212,38528,90717,216648,516358,1240818,2979992]