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A003104 as a simple table

na(n)
11
21
32
44
510
624
767
8182
9520
101474
114248
1212196
1335168
14101226
15291565
16838764
172412033
186929754
1919896915
2057084939

[1,1,2,4,10,24,67,182,520,1474,4248,12196,35168,
 101226,291565,838764,2412033,6929754,19896915,
 57084939]