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A297954 as a simple table

na(n)
11
27
315
425
547
6109
7245
8545
91253
102859
116557
1215131
1334879
1480643
15186663
16432253
171002043
182323805
195391149
2012511905
2129043489
2267430735
23156577101
24363614071
25844480819
261961394067
274555748943
2810582066605
2924580613559
3057098398457

[1,7,15,25,47,109,245,545,1253,2859,6557,15131,
 34879,80643,186663,432253,1002043,2323805,5391149,
 12511905,29043489,67430735,156577101,363614071,
 844480819,1961394067,4555748943,10582066605,
 24580613559,57098398457]