A097790 - OEIS

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A097790 as a simple table

n	a(n)
0	1
1	9
2	55
3	295
4	1510
5	7606
6	38114
7	190690
8	953615
9	4768295
10	23841761
11	119209169
12	596046300
13	2980232060
14	14901160980
15	74505805716
16	372529029549
17	1862645148885
18	9313225745755
19	46566128730315
20	232830643653346

[1,9,55,295,1510,7606,38114,190690,953615,4768295, 23841761,119209169,596046300,2980232060, 14901160980,74505805716,372529029549, 1862645148885,9313225745755,46566128730315, 232830643653346]