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A106186 as a simple table

na(n)
01
12
24
316
464
5224
6800
73008
811392
943008
10163328
11624640
122397696
139227264
1435608576
15137764864
16534102016
172074394624
188069922816
1931440338944
20122652655616
21479052693504
221873097261056
237331070869504
2428718945140736

[1,2,4,16,64,224,800,3008,11392,43008,163328,
 624640,2397696,9227264,35608576,137764864,
 534102016,2074394624,8069922816,31440338944,
 122652655616,479052693504,1873097261056,
 7331070869504,28718945140736]