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A181383 as a simple table

na(n)
01
13
29
325
467
5151
6349
7805
81831
94069
109063
1119767
1242975
1392829
14199123
15425229
16904225
171915381
184044235
198513505
2017872759
2137432615
2278225409
23163146639
24339638307
25705882493
261464816541
273035420871
286281814787
2912984437515
3026808298093
3155291335127

[1,3,9,25,67,151,349,805,1831,4069,9063,19767,
 42975,92829,199123,425229,904225,1915381,4044235,
 8513505,17872759,37432615,78225409,163146639,
 339638307,705882493,1464816541,3035420871,
 6281814787,12984437515,26808298093,55291335127]