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A241843 as a simple table

na(n)
10
20
30
41
56
654
7581
89503
9249169
1011607032
111005452874
12164042264045
1350335602558672
1429003480904157108

[0,0,0,1,6,54,581,9503,249169,11607032,1005452874,
 164042264045,50335602558672,29003480904157108]