A191370 - OEIS

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A191370 as a simple table

n	a(n)
0	1
1	2
2	4
3	2
4	4
5	8
6	22
7	44
8	88
9	170
10	340
11	680
12	1366
13	2732
14	5464
15	10922
16	21844
17	43688
18	87382
19	174764
20	349528
21	699050
22	1398100
23	2796200
24	5592406
25	11184812
26	22369624
27	44739242

[1,2,4,2,4,8,22,44,88,170,340,680,1366,2732,5464, 10922,21844,43688,87382,174764,349528,699050, 1398100,2796200,5592406,11184812,22369624, 44739242]