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A146688 as a simple table

na(n)
11
21
31
41
51
61
71
815
935
1063
11133
12361
131225
143603
1514173
1668577
17327107
181804859
199535581
2056798795
21377223653

[1,1,1,1,1,1,1,15,35,63,133,361,1225,3603,14173,
 68577,327107,1804859,9535581,56798795,377223653]