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A057730 as a simple table

n a(n)
1 0
2 1
3 1
4 3
5 6
6 25
7 86
8 416
9 1988
10 10640
11 57987
12 328956
13 1900321
14 11204350
15 67042778
16 406780346 

[0,1,1,3,6,25,86,416,1988,10640,57987,328956,
 1900321,11204350,67042778,406780346]

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Last modified August 28 11:32 EDT 2024. Contains 375502 sequences. (Running on oeis4.)