id:A111288 - OEIS Search Results

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a(1) = a(2) = a(3) = a(4) = 1. For n>= 5, a(n) = a(n-1)*a(n-3) + a(n-2)*a(n-4).

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1, 1, 1, 1, 2, 3, 5, 13, 49, 284, 3937, 196605, 56028733, 220640957641, 43379336062130626, 2430489281321503732285663, 536265482569392926735606762349877841, 23262840586898349755381222452865322555989091379459449 (list; graph; listen)

	OFFSET	`1,5`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	PROGRAM	`(PARI) a(n)=if(n<5, 1, a(n-1)a(n-3) + a(n-2)a(n-4)) (Klasen)`
	CROSSREFS	`Sequence in context: A048634 A012899 A110364 this_sequence A064526 A103594 A042695` `Adjacent sequences: A111285 A111286 A111287 this_sequence A111289 A111290 A111291`
	KEYWORD	`easy,nonn`
	AUTHOR	`Leroy Quet Nov 01 2005`
	EXTENSIONS	`More terms from Lambert Klasen (lambert.klasen(AT)gmx.net), Nov 06 2005`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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