A136401 - OEIS

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A136401

a(n)=3a(n-1)-4a(n-2)+6a(n-3)-4a(n-4).

0, 0, 0, 1, 3, 5, 9, 21, 45, 85, 165, 341, 693 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	FORMULA	`a(n)=-(1/3)+(1/6)2^n+(1/12)[Isqrt(2)]^n+(1/12)[ -I*sqrt(2)]^n, with n>=0 and I=sqrt(-1) - Paolo P. Lava (paoloplava(AT)gmail.com), Jun 09 2008`
	CROSSREFS	`Sequence in context: A050355 A147039 A069927 * A147758 A129787 A125517` `Adjacent sequences: A136398 A136399 A136400 * A136402 A136403 A136404`
	KEYWORD	`nonn`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Mar 30 2008`

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Last modified February 15 15:20 EST 2012. Contains 205823 sequences.