A097165 - OEIS

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A097165 as a simple table

n	a(n)
0	1
1	7
2	41
3	227
4	1221
5	6447
6	33601
7	173467
8	889181
9	4533287
10	23015961
11	116477907
12	587981941
13	2962279327
14	14900875121
15	74862289547
16	375743103501
17	1884442140567
18	9445117195081
19	47317211944387
20	236952563597861

[1,7,41,227,1221,6447,33601,173467,889181,4533287, 23015961,116477907,587981941,2962279327, 14900875121,74862289547,375743103501, 1884442140567,9445117195081,47317211944387, 236952563597861]