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A003500 as a simple table

na(n)
02
14
214
352
4194
5724
62702
710084
837634
9140452
10524174
111956244
127300802
1327246964
14101687054
15379501252
161416317954
175285770564
1819726764302
1973621286644
20274758382274
211025412242452
223826890587534
2314282150107684
2453301709843202
25198924689265124

[2,4,14,52,194,724,2702,10084,37634,140452,524174,
 1956244,7300802,27246964,101687054,379501252,
 1416317954,5285770564,19726764302,73621286644,
 274758382274,1025412242452,3826890587534,
 14282150107684,53301709843202,198924689265124]