id:A064268 - OEIS Search Results

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a(n)=(a(n-1)*a(n-6)+2*a(n-3)*a(n-4))/a(n-7). Somos-7 variation.

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1, 1, 1, 1, 1, 1, 1, 3, 5, 7, 13, 43, 113, 521, 1241, 3681, 23657, 177721, 679505, 4674203, 27273277, 275517767, 3496390229, 37043734803, 226196947873, 4391322667601, 81041508965617, 1433151398896001, 25397505914206225 (list; graph; listen)

	OFFSET	`1,8`
	PROGRAM	`(PARI) a(n)=if(n<0, a(6-n), if(n<7, 1, (a(n-1)a(n-6)+2a(n-3)*a(n-4))/a(n-7)))`
	CROSSREFS	`Cf. A006723.` `Sequence in context: A047933 A075557 A057187 this_sequence A118743 A114980 A024372` `Adjacent sequences: A064265 A064266 A064267 this_sequence A064269 A064270 A064271`
	KEYWORD	`nonn,easy`
	AUTHOR	`Michael Somos, Sep 24, 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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