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A320326 as a simple table

na(n)
01
11
25
323
4113
5568
62905
715040
878581
9413496
102188204
1111633666
1262089785
13332459890
141785132500
159608402738
1651826221461
17280063787170
181515943655628
198217729019538
2044606550971500
21242419877520384
221318902900434870

[1,1,5,23,113,568,2905,15040,78581,413496,2188204,
 11633666,62089785,332459890,1785132500,9608402738,
 51826221461,280063787170,1515943655628,
 8217729019538,44606550971500,242419877520384,
 1318902900434870]