A270222 - OEIS

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A270222 as a simple table

n	a(n)
0	1
1	5
2	33
3	161
4	705
5	2945
6	12033
7	48641
8	195585
9	784385
10	3141633
11	12574721
12	50315265
13	201293825
14	805240833
15	3221094401

[1,5,33,161,705,2945,12033,48641,195585,784385, 3141633,12574721,50315265,201293825,805240833, 3221094401]