|
|
A163063
|
|
Lucas(3n+2) = Fibonacci(3n+1) + Fibonacci(3n+3).
|
|
6
|
|
|
3, 11, 47, 199, 843, 3571, 15127, 64079, 271443, 1149851, 4870847, 20633239, 87403803, 370248451, 1568397607, 6643838879, 28143753123, 119218851371, 505019158607, 2139295485799, 9062201101803, 38388099893011
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,1
|
|
COMMENTS
|
Binomial transform of A163062. Second binomial transform of A163114. Inverse binomial transform of A098648 without initial 1.
|
|
LINKS
|
|
|
FORMULA
|
a(n) = 4*a(n-1)+a(n-2) for n > 1; a(0) = 3, a(1) = 11.
G.f.: (3-x)/(1-4*x-x^2).
a(n) = ((3+sqrt(5))*(2+sqrt(5))^n+(3-sqrt(5))*(2-sqrt(5))^n)/2.
|
|
MAPLE
|
|
|
MATHEMATICA
|
Table[Fibonacci[3n + 1] + Fibonacci[3n + 3], {n, 0, 21}] (* Alonso del Arte, Nov 29 2010 *)
LinearRecurrence[{4, 1}, {3, 11}, 30] (* Harvey P. Dale, Apr 14 2021 *)
|
|
PROG
|
(Magma) Z<x>:=PolynomialRing(Integers()); N<r>:=NumberField(x^2-5); S:=[ ((3+r)*(2+r)^n+(3-r)*(2-r)^n)/2: n in [0..21] ]; [ Integers()!S[j]: j in [1..#S] ]; // Klaus Brockhaus, Jul 21 2009
(PARI) Vec((3-x)/(1-4*x-x^2) + O(x^100)) \\ Altug Alkan, Dec 10 2015
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Al Hakanson (hawkuu(AT)gmail.com), Jul 20 2009
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|