A376196 - OEIS

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A376196 as a simple table

n	a(n)
1	3
2	9
3	21
4	45
5	92
6	177
7	351
8	702
9	1379
10	2724
11	5412
12	10787
13	21502
14	42958
15	85791
16	171441
17	342216
18	683462
19	1365580
20	2729447
21	5456194
22	10908253
23	21812343
24	43616683
25	87223016
26	174430392

[3,9,21,45,92,177,351,702,1379,2724,5412,10787, 21502,42958,85791,171441,342216,683462,1365580, 2729447,5456194,10908253,21812343,43616683, 87223016,174430392]