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A197156 as a simple table

na(n)
11
23
35
420
556
6225
7819
83333
913336
1055231
11229146
12963284
134068503
1417301000
1573893082

[1,3,5,20,56,225,819,3333,13336,55231,229146,
 963284,4068503,17301000,73893082]