|
Search: id:A080244
|
|
|
| A080244 |
|
Signed generalized Fibonacci numbers. |
|
+0
3
|
|
| 1, -2, 7, -26, 107, -468, 2141, -10124, 49101, -242934, 1221427, -6222838, 32056215, -166690696, 873798681, -4612654808, 24499322137, -130830894666, 702037771647, -3783431872018, 20469182526595, -111133368084892, 605312629105205, -3306633429423460, 18111655081108453
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Diagonal sums of triangle A080245
|
|
FORMULA
|
G.f.: (-1-x+2*x^2+sqrt(1+6*x+x^2))/(2*x*(1+x+x^2-x^3)) - C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004
|
|
MAPLE
|
seq(coeff(convert(series((-1-x+2*x^2+sqrt(1+6*x+x^2))/(2*x*(1+x+x^2-x^3)), x, 50), polynom), x, i), i=0..30); (C. Ronaldo)
|
|
CROSSREFS
|
|a(n)| = A006603.
Sequence in context: A150568 A102319 A006603 this_sequence A124542 A003447 A150569
Adjacent sequences: A080241 A080242 A080243 this_sequence A080245 A080246 A080247
|
|
KEYWORD
|
sign,easy
|
|
AUTHOR
|
Paul Barry (pbarry(AT)wit.ie), Feb 13 2003
|
|
EXTENSIONS
|
More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004
|
|
|
Search completed in 0.002 seconds
|
