A273747 - OEIS

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A273747 as a simple table

n	a(n)
0	1
1	5
2	25
3	97
4	405
5	1501
6	5605
7	22533
8	90197
9	361361
10	1445569
11	5767901
12	23042037
13	92096381
14	368249841
15	1472853613

[1,5,25,97,405,1501,5605,22533,90197,361361, 1445569,5767901,23042037,92096381,368249841, 1472853613]