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A051199 as a simple table

n a(n)
0 0
1 8
2 40
3 216
4 980
5 4368
6 18468
7 77520
8 319440
9 1307448
10 5310448
11 21474180
12 86488020
13 347373600
14 1391956192
15 5567901768
16 22239898848
17 88732378800
18 353696824152
19 1408831480056
20 5608231863080
21 22314239255088

[0,8,40,216,980,4368,18468,77520,319440,1307448,
 5310448,21474180,86488020,347373600,1391956192,
 5567901768,22239898848,88732378800,353696824152,
 1408831480056,5608231863080,22314239255088]

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Last modified January 23 11:59 EST 2022. Contains 350512 sequences. (Running on oeis4.)