A102264 - OEIS

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A102264 as a simple table

n	a(n)
1	5
2	17
3	41
4	257
5	521
6	4481
7	9521
8	21929
9	72089
10	531977
11	1256009
12	5014169
13	20879129
14	70993529
15	258844361
16	866941841
17	3771185921

[5,17,41,257,521,4481,9521,21929,72089,531977, 1256009,5014169,20879129,70993529,258844361, 866941841,3771185921]