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A091881 as a simple table

na(n)
01
16
286
31366
421846
5349526
65592406
789478486
81431655766
922906492246
10366503875926
115864062014806
1293824992236886
131501199875790166
1424019198012642646
15384307168202282326
166148914691236517206

[1,6,86,1366,21846,349526,5592406,89478486,
 1431655766,22906492246,366503875926,5864062014806,
 93824992236886,1501199875790166,24019198012642646,
 384307168202282326,6148914691236517206]