A097677 - OEIS

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A097677 as a simple table

n	a(n)
0	1
1	3
2	9
3	33
4	171
5	1053
6	7119
7	57267
8	525609
9	5164803
10	56726649
11	690532857
12	8889138531
13	124010345277
14	1880154795519
15	29907812576187
16	506398197859281
17	9190226159295363
18	173999328850897641
19	3466197108906552657

[1,3,9,33,171,1053,7119,57267,525609,5164803, 56726649,690532857,8889138531,124010345277, 1880154795519,29907812576187,506398197859281, 9190226159295363,173999328850897641, 3466197108906552657]