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A218964 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 5
5 21
6 91
7 666
8 3851
9 30955
10 144691
11 1748836
12 27197611
13 313477451

[1,1,1,1,5,21,91,666,3851,30955,144691,1748836,
 27197611,313477451]

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Last modified March 29 10:59 EDT 2024. Contains 371277 sequences. (Running on oeis4.)