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A007874 as a simple table

na(n)
11
21
31
42
54
610
724
863
9177
10428
111230
122556
138202
1418506
1518162
16119069

[1,1,1,2,4,10,24,63,177,428,1230,2556,8202,18506,
 18162,119069]