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A252787 as a simple table

na(n)
00
10
21
33
47
528
6131
726465
82832610615
918602165186505644
101577146952504975321253720851

[0,0,1,3,7,28,131,26465,2832610615,
 18602165186505644,1577146952504975321253720851]