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A020523 as a simple table

na(n)
0-1
19
2161
31665
414849
5124929
61024001
78290305
866715649
9535298049
104288675841
1134334572545
12274777243649
132198620602369
1417590575431681
15140731045904385
161125874137038849
179007096175525889
1872057181721067521
19576459103035981825

[-1,9,161,1665,14849,124929,1024001,8290305,
 66715649,535298049,4288675841,34334572545,
 274777243649,2198620602369,17590575431681,
 140731045904385,1125874137038849,9007096175525889,
 72057181721067521,576459103035981825]