A273145 - OEIS

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A273145 as a simple table

n	a(n)
0	1
1	8
2	41
3	193
4	833
5	3457
6	14081
7	56833
8	228353
9	915457
10	3665921
11	14671873
12	58703873
13	234848257
14	939458561
15	3757965313

[1,8,41,193,833,3457,14081,56833,228353,915457, 3665921,14671873,58703873,234848257,939458561, 3757965313]