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A155596 as a simple table

n a(n)
0 1
1 4
2 22
3 118
4 610
5 3094
6 15562
7 77998
8 390370
9 1952614
10 9764602
11 48826078
12 244136530
13 1220694934
14 6103499242
15 30517545358
16 152587825090
17 762939322054
18 3814697003482
19 19073485803838
20 95367430592050
21 476837156105974

[1,4,22,118,610,3094,15562,77998,390370,1952614,
 9764602,48826078,244136530,1220694934,6103499242,
 30517545358,152587825090,762939322054,
 3814697003482,19073485803838,95367430592050,
 476837156105974]

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Last modified April 17 23:03 EDT 2021. Contains 343071 sequences. (Running on oeis4.)