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A005304
as a simple table
n
a(n)
1
2
2
2
3
4
4
10
5
18
6
32
7
58
8
98
9
164
10
274
11
442
12
704
13
1114
14
1730
15
2660
16
4058
17
6114
18
9136
19
13554
20
19930
[2,2,4,10,18,32,58,98,164,274,442,704,1114,1730, 2660,4058,6114,9136,13554,19930]