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A180840 as a simple table

na(n)
11
20
32
417
5131
61220
713796
8183095
92790353
1048045596
11922507880
1219543670381
13452869998215

[1,0,2,17,131,1220,13796,183095,2790353,48045596,
 922507880,19543670381,452869998215]