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A149757 as a simple table

na(n)
01
11
25
317
485
5343
61715
77501
837505
9171085
10855425
113999601
1219998005
1394992091
14474960455
152280616019
1611403080095
1755180159045
18275900795225
191342819665229
206714098326145
2132822357011259
22164111785056295
23805053179115385
244025265895576925
2519800669173042077
2699003345865210385

[1,1,5,17,85,343,1715,7501,37505,171085,855425,
 3999601,19998005,94992091,474960455,2280616019,
 11403080095,55180159045,275900795225,
 1342819665229,6714098326145,32822357011259,
 164111785056295,805053179115385,4025265895576925,
 19800669173042077,99003345865210385]