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A222807 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 0
12 0
13 0
14 0
15 4
16 10
17 30
18 66
19 144
20 314
21 692
22 1452
23 3046
24 6388
25 13298
26 27274
27 56164
28 113672
29 231892
30 470984
31 950178
32 1912700
33 3868034
34 7772172
35 15651674
36 31464544
37 63154106
38 126603428
39 254088618
40 508541874
41 1018817124

[0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,10,30,66,144,314,
 692,1452,3046,6388,13298,27274,56164,113672,
 231892,470984,950178,1912700,3868034,7772172,
 15651674,31464544,63154106,126603428,254088618,
 508541874,1018817124]

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Last modified April 20 02:14 EDT 2024. Contains 371798 sequences. (Running on oeis4.)