id:A086889 - OEIS Search Results

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Real part of Propp's cubic recurrence starting with i (i^2=-1).

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2

0, 0, 0, 0, -1, 1, -3, -3, -41, 140, -93456, 280356252, -471833669834248, 40261350925439315783335171, 20143180524957577201436416071451979623101429, 9048277144756224572757714728840507662214586396123974675011643142128755383165 (list; graph; listen)

	OFFSET	`1,7`
	COMMENT	`b(n)=x(n)+i*y(n) where x(n) and y(n) are integer sequences.`
	FORMULA	`a(n)=Re(b(n)) where b(1)=b(2)=b(3)=b(4)=i and b(n)=(1+b(n-1)b(n-2)b(n-3))/b(n-4)`
	CROSSREFS	`Cf. A051786, A086890.` `Sequence in context: A067098 A088060 A082394 this_sequence A059495 A083391 A009809` `Adjacent sequences: A086886 A086887 A086888 this_sequence A086890 A086891 A086892`
	KEYWORD	`sign`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Sep 17 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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