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A212149
as a simple table
n
a(n)
1
0
2
0
3
0
4
1
5
4
6
13
7
34
8
82
9
185
10
403
11
853
12
1777
13
3656
14
7465
15
15156
16
30659
17
61850
18
124548
19
250456
20
503158
[0,0,0,1,4,13,34,82,185,403,853,1777,3656,7465, 15156,30659,61850,124548,250456,503158]
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Last modified April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)