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A000280 as a simple table

n a(n)
0 0
1 1
2 1
3 2
4 3
5 11
6 38
7 1369
8 56241
9 2565782650
10 177895665388171
11 16891164530321501264425013171
12 5629840598310484749297545401724540333537382 

[0,1,1,2,3,11,38,1369,56241,2565782650,
 177895665388171,16891164530321501264425013171,
 5629840598310484749297545401724540333537382]

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Last modified April 24 10:11 EDT 2024. Contains 371935 sequences. (Running on oeis4.)