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A000280 as a simple table

na(n)
00
11
21
32
43
511
638
71369
856241
92565782650
10177895665388171
1116891164530321501264425013171
125629840598310484749297545401724540333537382

[0,1,1,2,3,11,38,1369,56241,2565782650,
 177895665388171,16891164530321501264425013171,
 5629840598310484749297545401724540333537382]