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A080643
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a(0)=0; for n>0, a(n) = 4^n - 2*3^(n-1).
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2
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0, 2, 10, 46, 202, 862, 3610, 14926, 61162, 249022, 1009210, 4076206, 16422922, 66045982, 265246810, 1064175886, 4266269482, 17093775742, 68461196410, 274103065966, 1097187104842, 4391072942302, 17571265338010, 70305982058446, 281286690353002, 1125335047769662
(list; graph; refs; listen; history; internal format)
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