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A147272 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
105
1113
1225
1349
14141
15407
161043
172925
1811783
1952869
20254667
211211663

[1,1,1,1,1,1,1,1,1,5,13,25,49,141,407,1043,2925,
 11783,52869,254667,1211663]