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A176777 a(n) = 2^n-n*(n-3). 1

%I #11 Apr 11 2024 03:54:40

%S 1,4,6,8,12,22,46,100,216,458,954,1960,3988,8062,16230,32588,65328,

%T 130834,261874,523984,1048236,2096774,4193886,8388148,16776712,

%U 33553882,67108266,134217080,268434756,536870158,1073741014,2147482780

%N a(n) = 2^n-n*(n-3).

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (5,-9,7,-2).

%F a(n) = +5*a(n-1) -9*a(n-2) +7*a(n-3) -2*a(n-4).

%F G.f.: ( 1-x-5*x^2+7*x^3 ) / ( (2*x-1)*(x-1)^3 ).

%t Table[2^n-n*(n-3),{n,0,5!}]

%Y Cf. A142974, A176776.

%K nonn,easy

%O 0,2

%A _Vladimir Joseph Stephan Orlovsky_, Apr 25 2010

%E Offset corrected by _R. J. Mathar_, Apr 28 2010

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Last modified June 20 10:31 EDT 2024. Contains 373516 sequences. (Running on oeis4.)