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A089023 as a simple table

n a(n)
0 1
1 4
2 28
3 232
4 2092
5 19864
6 195352
7 1970896
8 20275660
9 211823800
10 2240795848

[1,4,28,232,2092,19864,195352,1970896,20275660,
 211823800,2240795848]

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Last modified July 5 17:04 EDT 2020. Contains 335473 sequences. (Running on oeis4.)