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A146781 as a simple table

na(n)
11
21
31
41
51
61
75
817
937
1069
11119
12413
131361
144953
1521841
16100255
17486625
182729263
1914571959
2098507721
21677047259

[1,1,1,1,1,1,5,17,37,69,119,413,1361,4953,21841,
 100255,486625,2729263,14571959,98507721,677047259]