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A013006 as a simple table

na(n)
01
14
216
3544
411008
51060224
638065152
79708670976
8276991311872
9283899182678016
10-9456062364418048
1121467065808907534336
12-3522630891818080796672
133483761539375407422242816

[1,4,16,544,11008,1060224,38065152,9708670976,
 276991311872,283899182678016,-9456062364418048,
 21467065808907534336,-3522630891818080796672,
 3483761539375407422242816]