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A006848 as a simple table

n a(n)
0 1
1 2
2 5
3 18
4 75
5 414
6 2643
7 20550
8 180057
9 1803330
10 19925541
11 242749602
12 3218286195
13 46082917278
14 710817377715
15 11689297807734
16 205359276208113
17 3812653265319810
18 75092750890627077
19 1553136587207991090
20 33876594618751675611
21 772263699644709647262

[1,2,5,18,75,414,2643,20550,180057,1803330,
 19925541,242749602,3218286195,46082917278,
 710817377715,11689297807734,205359276208113,
 3812653265319810,75092750890627077,
 1553136587207991090,33876594618751675611,
 772263699644709647262]

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Last modified February 19 19:20 EST 2019. Contains 320328 sequences. (Running on oeis4.)