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A086615 as a simple table

n a(n)
0 1
1 2
2 4
3 8
4 17
5 38
6 89
7 216
8 539
9 1374
10 3562
11 9360
12 24871
13 66706
14 180340
15 490912
16 1344379
17 3701158
18 10237540
19 28436824
20 79288843
21 221836402
22 622599625
23 1752360040
24 4945087837
25 13988490338
26 39658308814
27 112666081616

[1,2,4,8,17,38,89,216,539,1374,3562,9360,24871,
 66706,180340,490912,1344379,3701158,10237540,
 28436824,79288843,221836402,622599625,1752360040,
 4945087837,13988490338,39658308814,112666081616]

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Last modified February 23 23:56 EST 2018. Contains 299595 sequences. (Running on oeis4.)