OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (9, -16, 9, -1).
FORMULA
G.f.: x(1+x) / ((1-7x+x^2)(1-x)^2).
a(n) = (1/5)*(Fibonacci(4n+2) - 2n - 1).
a(n) = Sum_{i=0..2n} (-1)^i*Fibonacci(i)*Fibonacci(i+1). - Rigoberto Florez, May 04 2019
MATHEMATICA
Accumulate[Fibonacci[Range[0, 40, 2]]^2] (* Harvey P. Dale, Nov 14 2013 *)
LinearRecurrence[{9, -16, 9, -1}, {0, 1, 10, 74}, 21] (* Ray Chandler, Sep 23 2015 *)
PROG
(Magma) [(1/5)*(Fibonacci(4*n+2)-2*n-1): n in [0..50]]; // Vincenzo Librandi, Apr 20 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Ralf Stephan, Feb 08 2005
STATUS
approved