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A281311 as a simple table

na(n)
01
13
21
37
417
555
617
7119
8321
9711
101105
113511
121
137
1417
15119
16321
171735
184177
1929111
2087041
21506887
221053713
237367799
2417892673
2558137287
264277329
2729810103
2872352769
29498080775
301410352145
314235320439
3289408833
33519953095
341074021457
357518150071

[1,3,1,7,17,55,17,119,321,711,1105,3511,1,7,17,
 119,321,1735,4177,29111,87041,506887,1053713,
 7367799,17892673,58137287,4277329,29810103,
 72352769,498080775,1410352145,4235320439,89408833,
 519953095,1074021457,7518150071]