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A099133 as a simple table

na(n)
00
11
24
332
4192
51280
68192
753248
8344064
92228224
1014417920
1193323264
12603979776
133909091328
1425300041728
15163745628160
161059783180288
176859062771712
1844392781971456
19287316132233216
201859549040476160
2112035254277636096
2277893801758162944

[0,1,4,32,192,1280,8192,53248,344064,2228224,
 14417920,93323264,603979776,3909091328,
 25300041728,163745628160,1059783180288,
 6859062771712,44392781971456,287316132233216,
 1859549040476160,12035254277636096,
 77893801758162944]