A129798 - OEIS

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A129798 as a simple table

n	a(n)
1	8
2	32
3	170
4	1024
5	6553
6	43690
7	299593
8	2097152
9	14913080
10	107374182
11	780903144
12	5726623061
13	42288908760
14	314146179364
15	2345624805922
16	17592186044416
17	132458812569720
18	1000799917193443
19	7585009898729256

[8,32,170,1024,6553,43690,299593,2097152,14913080, 107374182,780903144,5726623061,42288908760, 314146179364,2345624805922,17592186044416, 132458812569720,1000799917193443,7585009898729256]