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A106567 as a simple table

n a(n)
0 0
1 4
2 20
3 116
4 660
5 3764
6 21460
7 122356
8 697620
9 3977524
10 22678100
11 129300596
12 737215380
13 4203279284
14 23965257940
15 136639406836
16 779058065940
17 4441847957044
18 25325472048980
19 144394752073076
20 823275648561300
21 4693957251098804
22 26762888849739220

[0,4,20,116,660,3764,21460,122356,697620,3977524,
 22678100,129300596,737215380,4203279284,
 23965257940,136639406836,779058065940,
 4441847957044,25325472048980,144394752073076,
 823275648561300,4693957251098804,
 26762888849739220]

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Last modified May 8 05:14 EDT 2024. Contains 372319 sequences. (Running on oeis4.)