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A091914 as a simple table

na(n)
01
12
216
356
4304
51280
66208
727776
8130048
9593408
102747392
1112615680
1258200064
13267788288
141233977344
155681414144
1626170556416
17120518082560
18555082842112
192556382674944
2011773759455232
2154224111009792
22249733335482368

[1,2,16,56,304,1280,6208,27776,130048,593408,
 2747392,12615680,58200064,267788288,1233977344,
 5681414144,26170556416,120518082560,555082842112,
 2556382674944,11773759455232,54224111009792,
 249733335482368]