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Search: id:A105723
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| 0, 4, 8, 28, 80, 244, 728, 2188, 6560, 19684, 59048, 177148, 531440, 1594324, 4782968, 14348908, 43046720, 129140164, 387420488, 1162261468, 3486784400, 10460353204, 31381059608, 94143178828, 282429536480, 847288609444
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OFFSET
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0,2
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COMMENT
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a(n)=A102345(n)-2*(-1)^n; (a(n)+A102345(n))/2=A000244(n);
A007814(a(n)) = A085058(n-1) for n>0.
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MAPLE
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g:=1/(1+3*z): gser:=series(g, z=0, 43): seq(abs(coeff(gser, z, n)-1), n=0..31); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 09 2009]
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CROSSREFS
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Sequence in context: A090083 A034515 A059480 this_sequence A143555 A025234 A075308
Adjacent sequences: A105720 A105721 A105722 this_sequence A105724 A105725 A105726
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 18 2005
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EXTENSIONS
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Corrected by T. D. Noe (noe(AT)sspectra.com), Dec 11 2006
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