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A080244
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Signed generalized Fibonacci numbers.
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2
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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; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Diagonal sums of triangle A080245
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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
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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)
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CROSSREFS
| |a(n)| = A006603.
Sequence in context: A150568 A102319 A006603 * A124542 A003447 A150569
Adjacent sequences: A080241 A080242 A080243 * A080245 A080246 A080247
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KEYWORD
| sign,easy
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Feb 13 2003
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EXTENSIONS
| More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004
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