id:A132418 - OEIS Search Results

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Sequence is identical to its third differences in absolute values: a(n+k)=3a(n+k-1)-3a(n+k-2)+2a(n+k-3), k=0, 1, 2, 3, 4, a(n+5)=3a(n+4)-3a(n+3), n > 2.

+0
2

1, 2, 3, 5, 10, 21, 43, 86, 129, 215, 430, 903, 1849, 3698, 5547, 9245, 18490, 38829, 79507 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`(6n+1)-th terms: 43, 43^2, 43^3, 43^4?`
	FORMULA	`6n-th terms of a(n) opposite to the 6-th of third differences.These terms are 21=37, 903=2143, 38829=21*43^2 .`
	CROSSREFS	`Sequence in context: A023170 A125312 A014626 this_sequence A024494 A131708 A002991` `Adjacent sequences: A132415 A132416 A132417 this_sequence A132419 A132420 A132421`
	KEYWORD	`nonn`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Nov 13 2007`

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

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