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A084851 as a simple table

n a(n)
0 1
1 4
2 13
3 38
4 104
5 272
6 688
7 1696
8 4096
9 9728
10 22784
11 52736
12 120832
13 274432
14 618496
15 1384448
16 3080192
17 6815744
18 15007744
19 32899072
20 71827456
21 156237824
22 338690048
23 731906048
24 1577058304
25 3388997632
26 7264534528
27 15535702016
28 33151778816

[1,4,13,38,104,272,688,1696,4096,9728,22784,52736,
 120832,274432,618496,1384448,3080192,6815744,
 15007744,32899072,71827456,156237824,338690048,
 731906048,1577058304,3388997632,7264534528,
 15535702016,33151778816]

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Last modified June 13 11:07 EDT 2021. Contains 344989 sequences. (Running on oeis4.)