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A193198 as a simple table

n a(n)
0 1
1 1
2 4
3 28
4 352
5 7696
6 296704
7 19845568
8 2325071872
9 472050401536
10 167325747134464
11 102717666720160768
12 109887628080679616512
13 203517277347030338768896
14 656102983404750860283019264
15 3660938644168893995628877692928

[1,1,4,28,352,7696,296704,19845568,2325071872,
 472050401536,167325747134464,102717666720160768,
 109887628080679616512,203517277347030338768896,
 656102983404750860283019264,
 3660938644168893995628877692928]

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Last modified October 16 17:06 EDT 2021. Contains 348042 sequences. (Running on oeis4.)