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A000281 as a simple table

na(n)
01
13
257
32763
4250737
536581523
67828053417
72309644635483
8898621108880097
9445777636063460643
10274613643571568682777
11205676334188681975553003
12184053312545818735778213457
13193944394596325636374396208563

[1,3,57,2763,250737,36581523,7828053417,
 2309644635483,898621108880097,445777636063460643,
 274613643571568682777,205676334188681975553003,
 184053312545818735778213457,
 193944394596325636374396208563]