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A011823 as a simple table

na(n)
12
29
3256
421147
51673856
689026966
73099627142
874407044673
91306811152024
1017675571563918
11191922235160156
121729283934497328
1313277799809473332
1488759840725469601
15525698154348040682

[2,9,256,21147,1673856,89026966,3099627142,
 74407044673,1306811152024,17675571563918,
 191922235160156,1729283934497328,
 13277799809473332,88759840725469601,
 525698154348040682]