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a(n) = 9-n.
1

%I #14 Jul 28 2024 16:49:46

%S 9,8,7,6,5,4,3,2,1,0,-1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,

%T -15,-16,-17,-18,-19,-20,-21,-22,-23,-24,-25,-26,-27,-28,-29,-30,-31,

%U -32,-33,-34,-35,-36,-37,-38,-39,-40,-41,-42,-43,-44,-45,-46,-47,-48,-49,-50,-51

%N a(n) = 9-n.

%H Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>.

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1).

%F G.f.: ( 9-10*x ) / ( (x-1)^2 ). - _R. J. Mathar_, Aug 26 2015

%t 9 - Range[0, 100] (* _Paolo Xausa_, Jul 28 2024 *)

%Y The negative of A023451.

%Y Cf. A022958 - A022995.

%K sign,easy

%O 0,1

%A _N. J. A. Sloane_