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A114845
as a simple table
n
a(n)
1
4
2
14
3
38
4
134
5
254
6
13238
7
252254
8
691958
9
952814
10
3316238
11
30364918838
12
210339665174
[4,14,38,134,254,13238,252254,691958,952814, 3316238,30364918838,210339665174]