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A065856 as a simple table

n a(n)
0 4
1 6
2 9
3 15
4 26
5 48
6 88
7 168
8 323
9 627
10 1225
11 2406
12 4736
13 9351
14 18504
15 36655
16 72730
17 144450
18 287147
19 571208
20 1136971
21 2264215
22 4510963
23 8990492
24 17923944
25 35743996
26 71298762
27 142249762
28 283859985
29 566537515
30 1130886504
31 2257704401
32 4507834166
33 9001524190

[4,6,9,15,26,48,88,168,323,627,1225,2406,4736,
 9351,18504,36655,72730,144450,287147,571208,
 1136971,2264215,4510963,8990492,17923944,35743996,
 71298762,142249762,283859985,566537515,1130886504,
 2257704401,4507834166,9001524190]

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Last modified February 23 07:11 EST 2020. Contains 332159 sequences. (Running on oeis4.)