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A240973 as a simple table

na(n)
11
21
32
44
514
6120
73222
8271287
964154817
1041653775052
1174220906305025
12364602274426789164

[1,1,2,4,14,120,3222,271287,64154817,41653775052,
 74220906305025,364602274426789164]