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A007613
(8^n + 2(-1)^n )/3.
(Formerly M2129)
+0
4
1, 2, 22, 170, 1366, 10922, 87382, 699050, 5592406, 44739242, 357913942, 2863311530, 22906492246, 183251937962, 1466015503702, 11728124029610, 93824992236886, 750599937895082, 6004799503160662, 48038396025285290
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Maintained by
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Last modified December 19 21:04 EST 2009. Contains 171054 sequences.
AT&T Labs Research
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