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A300461 as a simple table

n a(n)
1 0
2 4
3 8
4 28
5 142
6 540
7 2585
8 11343
9 51501
10 233028
11 1052448
12 4769842
13 21579345
14 97715668
15 442378911
16 2002838338
17 9067930634
18 41054700887
19 185876096558
20 841553822832
21 3810142997823
22 17250454214015
23 78101569076062

[0,4,8,28,142,540,2585,11343,51501,233028,1052448,
 4769842,21579345,97715668,442378911,2002838338,
 9067930634,41054700887,185876096558,841553822832,
 3810142997823,17250454214015,78101569076062]

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Last modified August 5 07:21 EDT 2020. Contains 336209 sequences. (Running on oeis4.)