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A026644
a(0) = 1, a(1) = 2, a(2) = 4; for n >= 3, a(n) = a(n-1) + 2*a(n-2) + 2.
+0
8
1, 2, 4, 10, 20, 42, 84, 170, 340, 682, 1364, 2730, 5460, 10922, 21844, 43690, 87380, 174762, 349524, 699050, 1398100, 2796202, 5592404, 11184810, 22369620, 44739242, 89478484, 178956970, 357913940, 715827882, 1431655764
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Maintained by
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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.
AT&T Labs Research
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