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A366272 as a simple table

na(n)
01
11
27
349
4399
53521
632767
7316673
83147775
931977985
10330544639
113465369601
1236759599103
13393820102657
144255079743487
1546313023946753
16507319247208447
175588706552643585
1861875364144283647
19688128167799619585
207683686768042639359

[1,1,7,49,399,3521,32767,316673,3147775,31977985,
 330544639,3465369601,36759599103,393820102657,
 4255079743487,46313023946753,507319247208447,
 5588706552643585,61875364144283647,
 688128167799619585,7683686768042639359]