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A207276 as a simple table

n a(n)
1 4
2 16
3 58
4 214
5 788
6 2902
7 10686
8 39350
9 144902
10 533586
11 1964872
12 7235426
13 26643664
14 98112376
15 361288084
16 1330403818
17 4899066416
18 18040275760
19 66431340558
20 244626139148
21 900808977386
22 3317130444708
23 12214969725478
24 44980288801238

[4,16,58,214,788,2902,10686,39350,144902,533586,
 1964872,7235426,26643664,98112376,361288084,
 1330403818,4899066416,18040275760,66431340558,
 244626139148,900808977386,3317130444708,
 12214969725478,44980288801238]

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Last modified October 26 11:10 EDT 2021. Contains 348267 sequences. (Running on oeis4.)