A112261 - OEIS

A112261

a(n) = A112260(n+1) - A112260(n).

-2, 0, 12, 20, -12, -60, 52, 420, 468, -700, -1548, 3300, 13588, 8580, -29388, -30940, 152148, 406980, 60532, -1043100, -236652, 6032900, 11173812, -4569180, -32487212, 19343940, 216401652, 273243620, -323927532, -880031100, 1489420852, 7157028900

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..32.

Index entries for linear recurrences with constant coefficients, signature (3,-6,8).

FORMULA

a(n) = 3*a(n-1)-6*a(n-2)+8*a(n-3); G.f.: -2*(3*x-1) / ((2*x-1)*(4*x^2-x+1)). - Colin Barker, Nov 02 2014

EXAMPLE

a(4) = A112260(5) - A112260(4) = 31-11 = 20.

CROSSREFS

Cf. A112259, A112260.

Sequence in context: A007207 A349932 A002929 * A134831 A074001 A228621

Adjacent sequences: A112258 A112259 A112260 * A112262 A112263 A112264

KEYWORD

sign

AUTHOR

Russell Walsmith, Aug 30 2005

EXTENSIONS

Name corrected and more terms from Colin Barker, Nov 02 2014

STATUS

approved