A374682 - OEIS

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A374682 as a simple table

n	a(n)
0	1
1	1
2	2
3	4
4	8
5	15
6	30
7	59
8	114
9	222
10	434
11	844
12	1641
13	3189
14	6192
15	12020
16	23320
17	45213
18	87624
19	169744
20	328684
21	636221
22	1231067
23	2381269
24	4604713
25	8901664

[1,1,2,4,8,15,30,59,114,222,434,844,1641,3189, 6192,12020,23320,45213,87624,169744,328684,636221, 1231067,2381269,4604713,8901664]