|
|
A147997
|
|
Number of nonnegative even integers <= Fibonacci(n).
|
|
0
|
|
|
1, 1, 1, 2, 2, 3, 5, 7, 11, 18, 28, 45, 73, 117, 189, 306, 494, 799, 1293, 2091, 3383, 5474, 8856, 14329, 23185, 37513, 60697, 98210, 158906, 257115, 416021, 673135, 1089155, 1762290, 2851444, 4613733, 7465177, 12078909
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,4
|
|
LINKS
|
|
|
FORMULA
|
a(n) = a(n-1) + a(n-2) + a(n-3) - a(n-4) - a(n-5) for n > 4.
G.f.: (1 + x)*(1 - x - x^3)/((1 - x)*(1 - x - x^2)*(1 + x + x^2)). (End)
|
|
MATHEMATICA
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
Definition and offset corrected by R. J. Mathar, Jan 30 2010
|
|
STATUS
|
approved
|
|
|
|