A085348 - OEIS

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A085348

Ratio-determined insertion sequence I(0.264) (see the link below).

1, 4, 19, 72, 341, 1292, 6119, 23184, 109801, 416020, 1970299, 7465176, 35355581, 133957148, 634430159, 2403763488, 11384387281, 43133785636, 204284540899, 774004377960, 3665737348901, 13888945017644, 65778987739319 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`This is one of the "twin" ratio-determined insertion sequences (RDIS) that are "children" in the next generation below the "parent" sequences I(0.25024) (A004253) and I(0.26816) (A001353) in the recurrence tree of RDIS sequences. The RDIS twin of this sequence is A085349. See the link for an explanation of RDIS twin. See A082630 or A082981 for other recent examples of RDIS sequences.`
	LINKS	`John W. Layman, Ratio-Determined Insertion Sequences and the Tree of their Recurrence Types`
	FORMULA	`It appears that a(n)=18a(n-2)-a(n-4).` `Apparently a(n)a(n+3) = -4 + a(n+1)a(n+2). - R. Stephan, May 29 2004`
	CROSSREFS	`Cf. A001353, A004253, A082630, A082981, A085349.` `Sequence in context: A129019 A167247 A027208 * A027232 A110688 A009450` `Adjacent sequences: A085345 A085346 A085347 * A085349 A085350 A085351`
	KEYWORD	`nonn`
	AUTHOR	`John W. Layman (layman(AT)math.vt.edu), Jun 24 2003`

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Last modified February 17 04:58 EST 2012. Contains 205985 sequences.