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A165747 a(n)=1-2n. +0
2
1, -1, -3, -5, -7, -9, -11, -13, -15, -17, -19, -21, -23, -25, -27, -29, -31, -33, -35, -37, -39, -41, -43, -45, -47, -49, -51, -53, -55, -57, -59, -61, -63, -65, -67, -69, -71, -73, -75, -77, -79, -81, -83, -85, -87, -89, -91, -93, -95, -97, -99, -101, -103 (list; graph; listen)
OFFSET

0,3

FORMULA

a(n)= -A060747(n). a(n)= 2*a(n-1)-a(n-2), a(0)= 1, a(1)= -1. G.f.: (1-3x)/(1-x)^2. a(n)= Sum_{k, 0<=k<=n} A112555(n,k)*(-2)^(n-k).

CROSSREFS

Cf. A060747

Sequence in context: A059533 A064679 A081874 this_sequence A053229 A157142 A004273

Adjacent sequences: A165744 A165745 A165746 this_sequence A165748 A165749 A165750

KEYWORD

easy,sign

AUTHOR

Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 26 2009

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Last modified November 25 13:47 EST 2009. Contains 167481 sequences.


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