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A007215 as a simple table

n a(n)
0 1
1 0
2 4
3 8
4 39
5 152
6 672
7 3016
8 13989
9 66664

[1,0,4,8,39,152,672,3016,13989,66664]

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Last modified August 24 16:10 EDT 2019. Contains 326295 sequences. (Running on oeis4.)