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A147254 as a simple table

na(n)
11
21
31
41
55
65
721
829
9145
10485
113243
1211105
13102013
14454621
156519613
1640834561
17722449417

[1,1,1,1,5,5,21,29,145,485,3243,11105,102013,
 454621,6519613,40834561,722449417]