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A366158
as a simple table
n
a(n)
0
1
1
5
2
25
3
77
4
179
5
355
6
609
7
995
8
1497
9
2167
10
2999
11
4069
12
5289
13
6841
14
8595
15
10661
16
13023
17
15777
18
18795
[1,5,25,77,179,355,609,995,1497,2167,2999,4069, 5289,6841,8595,10661,13023,15777,18795]