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A139681 as a simple table

na(n)
01
12
28
364
41024
532768
61914733
7178499118
823973965155
94356864886906
101028823851939030
11306635655405986312
12112789704243814005142
1350281311185009713150048
1426760450115727957945767409
1516787646103442094018698106106
1612278130772483524854754380090307

[1,2,8,64,1024,32768,1914733,178499118,
 23973965155,4356864886906,1028823851939030,
 306635655405986312,112789704243814005142,
 50281311185009713150048,
 26760450115727957945767409,
 16787646103442094018698106106,
 12278130772483524854754380090307]