A107383 - OEIS

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A107383

a(n) = 2*a(n-2)+2*a(n-3).

0, 1, 1, 2, 4, 6, 12, 20, 36, 64, 112, 200, 352, 624, 1104, 1952, 3456, 6112, 10816, 19136, 33856, 59904, 105984, 187520, 331776, 587008, 1038592, 1837568, 3251200, 5752320, 10177536, 18007040, 31859712, 56369152, 99733504, 176457728 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,4`
	LINKS	`Table of n, a(n) for n=0..35.` `Index to sequences with linear recurrences with constant coefficients, signature (0,2,2).`
	FORMULA	`G.f.: x(1+x)/(1-2x^2-2x^3). [Sep 28 2009]` `a(n) = (-1)^(n+1)A078025(n-1) [Sep 28 2009]` `Limit a(n)/a(n-1) = 1.7692923..` `a(n)+a(n+1) = A061279(n). - R. J. Mathar, Dec 01 2011`
	MATHEMATICA	`m = 2 a[0] = 0; a[1] = 1; a[2] = 1; a[3] = 2; a[n_] := a[n] = a[n - 1] + ma[n - 2] - ma[n - 4] digits = 50`
	CROSSREFS	`Sequence in context: A068018 A060798 A134320 * A078025 A178901 A164146` `Adjacent sequences: A107380 A107381 A107382 * A107384 A107385 A107386`
	KEYWORD	`nonn,easy`
	AUTHOR	`Roger L. Bagula, May 24 2005`
	EXTENSIONS	`Definition replaced by recurrence by the Associate Editors of the OEIS, Sep 28 2009`
	STATUS	`approved`

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Last modified May 25 18:03 EDT 2013. Contains 225647 sequences.