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A243787 as a simple table

na(n)
11
21
32
45
514
652
7228
81209
97463
1052520
11407856
123414672
1330229061
14279124327

[1,1,2,5,14,52,228,1209,7463,52520,407856,3414672,
 30229061,279124327]