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A067646 as a simple table

n a(n)
0 1
1 2
2 4
3 8
4 24
5 72
6 264
7 1074
8 4490
9 20296
10 92768
11 439148
12 2118654
13 10377708
14 51740280
15 260545092
16 1328891356
17 6836872181

[1,2,4,8,24,72,264,1074,4490,20296,92768,439148,
 2118654,10377708,51740280,260545092,1328891356,
 6836872181]

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Last modified June 25 09:48 EDT 2019. Contains 324347 sequences. (Running on oeis4.)