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A091914 as a simple table

n a(n)
0 1
1 2
2 16
3 56
4 304
5 1280
6 6208
7 27776
8 130048
9 593408
10 2747392
11 12615680
12 58200064
13 267788288
14 1233977344
15 5681414144
16 26170556416
17 120518082560
18 555082842112
19 2556382674944
20 11773759455232
21 54224111009792
22 249733335482368

[1,2,16,56,304,1280,6208,27776,130048,593408,
 2747392,12615680,58200064,267788288,1233977344,
 5681414144,26170556416,120518082560,555082842112,
 2556382674944,11773759455232,54224111009792,
 249733335482368]

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Last modified November 26 10:00 EST 2014. Contains 250038 sequences.