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A000278 as a simple table

n a(n)
0 0
1 1
2 1
3 2
4 3
5 7
6 16
7 65
8 321
9 4546
10 107587
11 20773703
12 11595736272
13 431558332068481
14 134461531248108526465
15 186242594112190847520182173826
16 18079903385772308300945867582153787570051
17 34686303861638264961101080464895364211215702792496667048327

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

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)