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A000278 as a simple table

na(n)
00
11
21
32
43
57
616
765
8321
94546
10107587
1120773703
1211595736272
13431558332068481
14134461531248108526465
15186242594112190847520182173826
1618079903385772308300945867582153787570051
1734686303861638264961101080464895364211215702792496667048327

[0,1,1,2,3,7,16,65,321,4546,107587,20773703,
 11595736272,431558332068481,134461531248108526465,
 186242594112190847520182173826,
 18079903385772308300945867582153787570051,
 34686303861638264961101080464895364211215702792496\
 667048327]