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A057266
as a simple table
n
a(n)
1
1
2
7
3
49
4
343
5
539
6
959
7
1309
8
2401
9
7889
10
16807
11
18851
12
78449
13
117649
14
142991
15
590773
16
814247
17
823543
[1,7,49,343,539,959,1309,2401,7889,16807,18851, 78449,117649,142991,590773,814247,823543]