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A012740 as a simple table

na(n)
01
10
28
3448
432384
53363712
6498146816
7101255683072
827100382101504
99228615461568512
103895169435932917760
111996505925721071157248
121222138138975234336751616
13880971359478741744513712128

[1,0,8,448,32384,3363712,498146816,101255683072,
 27100382101504,9228615461568512,
 3895169435932917760,1996505925721071157248,
 1222138138975234336751616,
 880971359478741744513712128]