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A228679 as a simple table

n a(n)
1 8
2 40
3 216
4 1152
5 6160
6 32928
7 176032
8 941056
9 5030848
10 26894720
11 143778176
12 768632832
13 4109082880
14 21967006208
15 117434808832
16 627802177536
17 3356207397888
18 17942161561600
19 95918137153536
20 512774840614912

[8,40,216,1152,6160,32928,176032,941056,5030848,
 26894720,143778176,768632832,4109082880,
 21967006208,117434808832,627802177536,
 3356207397888,17942161561600,95918137153536,
 512774840614912]

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Last modified December 8 01:25 EST 2021. Contains 349590 sequences. (Running on oeis4.)