id:A111289 - 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-4) + a(n-2)*a(n-3).

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1, 1, 1, 1, 2, 3, 5, 11, 37, 166, 1237, 19749, 936055, 179814643, 240916863586, 4926183534613279, 4654499108310829164143, 838133896191338105830469104443, 201943518452400520392903690464302135967495, 994814736615560793049792416556718062880283217474796953454 (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-4) + a(n-2)a(n-3)) (Klasen)`
	CROSSREFS	`Sequence in context: A167604 A065510 A006721 this_sequence A127181 A113734 A003686` `Adjacent sequences: A111286 A111287 A111288 this_sequence A111290 A111291 A111292`
	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 7 08:40 EST 2009. Contains 170430 sequences.

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