id:A078530 - OEIS Search Results

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Bilinear recursive sequence.

+0
2

0, 3, 1, 1, 1, 1, 2, 3, 9, 27, 81, 729, 0, 59049, -531441, 14348907, -387420489, 10460353203, -564859072962, 22876792454961, -1853020188851841, 150094635296999121, -12157665459056928801, 2954312706550833698643, 0 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)a(n-8)=81(a(n-2)a(n-6)-2a(n-4)^2).` `0=a(n)a(n-5)+3a(n-1)a(n-4)-9a(n-2)a(n-3).`
	PROGRAM	`(PARI) a(n)=sign(n%12)(1+(n%12==6))(-1)^(n\12%2(n-1))3^((n%12==0)+(n-4)^2\8)`
	CROSSREFS	`Cf. A078529, A006720, A006721.` `Sequence in context: A023591 A107711 A061893 this_sequence A010276 A049639 A046555` `Adjacent sequences: A078527 A078528 A078529 this_sequence A078531 A078532 A078533`
	KEYWORD	`sign,easy`
	AUTHOR	`Michael Somos, Nov 25, 2002`

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.

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