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A237861 as a simple table

n a(n)
1 81
2 336
3 1414
4 6030
5 25525
6 107272
7 453088
8 1919632
9 8117752
10 34231344
11 144659936
12 611705384
13 2586040156
14 10917301088
15 46143495072
16 194990974880
17 824264967728
18 3481115148416
19 14714216616096
20 62164050866784
21 262771277795472

[81,336,1414,6030,25525,107272,453088,1919632,
 8117752,34231344,144659936,611705384,2586040156,
 10917301088,46143495072,194990974880,824264967728,
 3481115148416,14714216616096,62164050866784,
 262771277795472]

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Last modified September 27 04:33 EDT 2022. Contains 357052 sequences. (Running on oeis4.)