A105723 - OEIS

This site is supported by donations to The OEIS Foundation.

A105723

3^n - (-1)^n.

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 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`a(n)=A102345(n)-2*(-1)^n; (a(n)+A102345(n))/2=A000244(n);` `A007814(a(n)) = A085058(n-1) for n>0.`
	MAPLE	`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]`
	CROSSREFS	`Sequence in context: A034515 A189546 A059480 * A143555 A025234 A075308` `Adjacent sequences: A105720 A105721 A105722 * A105724 A105725 A105726`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 18 2005`
	EXTENSIONS	`Corrected by T. D. Noe (noe(AT)sspectra.com), Dec 11 2006`

Content is available under The OEIS End-User License Agreement .

Last modified February 16 19:48 EST 2012. Contains 205955 sequences.