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A226396
as a simple table
n
a(n)
1
2
2
48
3
224
4
912
5
2674
6
6900
7
15614
8
37804
9
74606
10
163304
11
286196
12
557084
13
887602
14
1518950
15
2861206
16
4438472
[2,48,224,912,2674,6900,15614,37804,74606,163304, 286196,557084,887602,1518950,2861206,4438472]