A273275 - OEIS

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A273275 as a simple table

n	a(n)
0	1
1	5
2	37
3	173
4	785
5	3137
6	12897
7	51897
8	207037
9	831069
10	3326637
11	13308985
12	53275677
13	213108805
14	852561341
15	3410229225

[1,5,37,173,785,3137,12897,51897,207037,831069, 3326637,13308985,53275677,213108805,852561341, 3410229225]