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A237623 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 1
7 2
8 6
9 14
10 30
11 62
12 129
13 252
14 499
15 984
16 1884
17 3624
18 7025
19 13358
20 25694
21 49316 

[0,0,0,0,0,1,2,6,14,30,62,129,252,499,984,1884,
 3624,7025,13358,25694,49316]

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Last modified May 8 07:09 EDT 2024. Contains 372319 sequences. (Running on oeis4.)