|
| |
|
|
A168050
|
|
Hankel transform of A168049.
|
|
2
|
|
|
|
1, 1, 0, -1, -1, -2, -2, -3, -3, -4, -4, -5, -5, -6, -6, -7, -7, -8, -8, -9, -9, -10, -10, -11, -11, -12, -12, -13, -13, -14, -14, -15, -15, -16, -16, -17, -17, -18, -18, -19, -19, -20, -20, -21, -21, -22, -22, -23, -23, -24, -24, -25, -25, -26, -26, -27, -27
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,6
|
|
|
LINKS
|
Table of n, a(n) for n=0..56.
Index to sequences with linear recurrences with constant coefficients, signature (1,1,-1)
|
|
|
FORMULA
|
G.f.: (1-2x^2-x^3-x^4)/((1+x)(1-x)^2);
a(n) = +1*a(n-1) +1*a(n-2) -1*a(n-3) [Joerg Arndt, Apr 2 2011]
a(n) = (-1)^n/4 -(2n-3)/4 +C(1,n) -C(0,n).
|
|
|
MATHEMATICA
|
Join[{1, 1, b=0}, a=0; Table[c=b+2*a+n; a=b; b=c, {n, -1, 60}]] (*From Vladimir Joseph Stephan Orlovsky, Apr 02 2011*)
|
|
|
CROSSREFS
|
Sequence in context: A080513 A111660 A127365 * A065033 A001057 A130472
Adjacent sequences: A168047 A168048 A168049 * A168051 A168052 A168053
|
|
|
KEYWORD
|
easy,sign
|
|
|
AUTHOR
|
Paul Barry, Nov 17 2009
|
|
|
STATUS
|
approved
|
| |
|
|
