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A186491 as a simple table

n a(n)
0 1
1 2
2 28
3 1112
4 87568
5 11447072
6 2239273408
7 612359887232
8 223061763490048
9 104399900177326592
10 61049165415292607488
11 43617245341775265585152
12 37385513306142843500105728
13 37862584188750782065354022912

[1,2,28,1112,87568,11447072,2239273408,
 612359887232,223061763490048,104399900177326592,
 61049165415292607488,43617245341775265585152,
 37385513306142843500105728,
 37862584188750782065354022912]

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Last modified August 12 12:09 EDT 2020. Contains 336439 sequences. (Running on oeis4.)