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Search: id:A091052
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| 1, 2, 13, 26, 205, 410, 3277, 6554, 52429, 104858, 838861, 1677722, 13421773, 26843546, 214748365, 429496730, 3435973837, 6871947674, 54975581389, 109951162778, 879609302221, 1759218604442, 14073748835533, 28147497671066
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OFFSET
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1,2
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FORMULA
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Add 1 to every term of A077854, then take the terms with indices 4k and 4k+3.
(1/20) [3*4^n - (-4)^n + 2*(-1)^n + 6]. - R. Stephan, Dec 02 2004
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CROSSREFS
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Cf. A091023, A091053.
Sequence in context: A018745 A117983 A018400 this_sequence A031090 A041017 A033837
Adjacent sequences: A091049 A091050 A091051 this_sequence A091053 A091054 A091055
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Feb 23 2004
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Feb 23 2006
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