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A002895 as a simple table

n a(n)
0 1
1 4
2 28
3 256
4 2716
5 31504
6 387136
7 4951552
8 65218204
9 878536624
10 12046924528
11 167595457792
12 2359613230144
13 33557651538688
14 481365424895488
15 6956365106016256
16 101181938814289564
17 1480129751586116848
18 21761706991570726096
19 321401321741959062016

[1,4,28,256,2716,31504,387136,4951552,65218204,
 878536624,12046924528,167595457792,2359613230144,
 33557651538688,481365424895488,6956365106016256,
 101181938814289564,1480129751586116848,
 21761706991570726096,321401321741959062016]

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Last modified February 28 14:02 EST 2021. Contains 341707 sequences. (Running on oeis4.)