A152620 a(n)=-8*a(n-1)-6*a(n-2), n>1 ; a(0)=1, a(1)=-2 .

1, -2, 10, -68, 484, -3464, 24808, -177680, 1272592, -9114656, 65281696, -467565632, 3348834880, -23985285248, 171789272704, -1230402470144, 8812484124928, -63117458178560, 452064760678912, -3237813336359936

Offset

0,2

Links

Table of n, a(n) for n=0..19.

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

Formula

G.f.: (1+6*x)/(1+8*x+6*x^2). a(n)=Sum_{k, 0<=k<=n}A147703(n,k)*(-3)^(n-k).

Mathematica

LinearRecurrence[{-8, -6}, {1, -2}, 30] (* Harvey P. Dale, Apr 03 2015 *)

Crossrefs

Cf. A152594

Sequence in context: A366178 A049036 A208561 * A152621 A147725 A074603

Adjacent sequences: A152617 A152618 A152619 * A152621 A152622 A152623

Keyword

sign

Author

Philippe Deléham, Dec 10 2008

Status

approved