id:A086890 - OEIS Search Results

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

+0
2

1, 1, 1, 1, -1, -2, 0, -10, 29, -689, 79779, -306741785, -537059115735445, 32782820784889194174016393, 123899509182081496572342154385115870319926534, 6620488215208352146569523585853411114659592927465468100410366988520167986216 (list; graph; listen)

	OFFSET	`1,6`
	COMMENT	`b(n)=x(n)+i*y(n) where x(n) and y(n) are integer sequences.`
	FORMULA	`a(n)=Im(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, A086889.` `Sequence in context: A019220 A019140 A065624 this_sequence A167387 A138542 A057862` `Adjacent sequences: A086887 A086888 A086889 this_sequence A086891 A086892 A086893`
	KEYWORD	`sign`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Sep 17 2003`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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