OFFSET
1,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..200
Index entries for linear recurrences with constant coefficients, signature (154,-6468,74088).
FORMULA
From R. J. Mathar, Sep 30 2008: (Start)
G.f.: x*(1+42*x)/((1-42*x)*(1-112*x+1764*x^2)).
a(n) = 154*a(n-1) - 6468*a(n-2) + 74088*a(n-3). (End)
PROG
(Magma) Z<x>:=PolynomialRing(Integers()); N<r7>:=NumberField(x^2-7); [ Integers()!a: a in [ ((7+r7)^n-(7-r7)^n)^2/28: n in [1..12] ] ]; // Klaus Brockhaus, Oct 20 2008
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Al Hakanson (hawkuu(AT)gmail.com), Sep 29 2008
EXTENSIONS
Extended by R. J. Mathar, Sep 30 2008
More terms from Andrew Howroyd, Nov 08 2025
STATUS
approved