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A146460 as a simple table

na(n)
11
21
31
41
55
625
787
8503
92831
1025037
11243793
123762955
1362868913
141572482009
1542577954723
161734990453303

[1,1,1,1,5,25,87,503,2831,25037,243793,3762955,
 62868913,1572482009,42577954723,1734990453303]