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A029890 as a simple table

na(n)
11
22
37
420
570
6234
7832
82956
910759
1039394
11145892
12543564
132038831
147684116
1529092055
16110550260
17421495147
181611662256

[1,2,7,20,70,234,832,2956,10759,39394,145892,
 543564,2038831,7684116,29092055,110550260,
 421495147,1611662256]