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A081951 as a simple table

na(n)
13
215
355
4253
51081
613861
7115921
8665281
918280081
1075479041
112080995841
1268302634401
13924972048001
1448318396825601
15495843855091201
1631747936252032001
17791764338474869761

[3,15,55,253,1081,13861,115921,665281,18280081,
 75479041,2080995841,68302634401,924972048001,
 48318396825601,495843855091201,31747936252032001,
 791764338474869761]