A155623 - OEIS

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A155623 as a simple table

n	a(n)
0	1
1	13
2	129
3	1357
4	14721
5	161293
6	1772289
7	19489357
8	214365441
9	2357967373
10	25937483649
11	285311847757
12	3138428908161
13	34522713738253
14	379749838366209
15	4177248183764557
16	45949729906618881
17	505447028628433933

[1,13,129,1357,14721,161293,1772289,19489357, 214365441,2357967373,25937483649,285311847757, 3138428908161,34522713738253,379749838366209, 4177248183764557,45949729906618881, 505447028628433933]