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A094253 as a simple table

na(n)
11
28
320
4120
5496
62304
710240
846208
9207360
10932352
114189184
1218827264
1384606976
14380223488
151708703744
167678853120
1734508439552
18155079540736
19696921096192
203131935031296
2114074788184064
2263251524091904

[1,8,20,120,496,2304,10240,46208,207360,932352,
 4189184,18827264,84606976,380223488,1708703744,
 7678853120,34508439552,155079540736,696921096192,
 3131935031296,14074788184064,63251524091904]