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A055540 as a simple table

n a(n)
1 0
2 2
3 4
4 14
5 38
6 153
7 766
8 6259
9 88064
10 2324157

[0,2,4,14,38,153,766,6259,88064,2324157]

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Last modified October 21 21:46 EDT 2019. Contains 328315 sequences. (Running on oeis4.)