A126945 - OEIS

%I #9 Mar 07 2024 17:11:06

%S 1,5,15,47,151,479,1519,4827,15333,48693,154651,491189,1560039,

%T 4954755,15736581,49980243,158739915,504166505,1601260009,5085687979,

%U 16152418715,51300951395,162934583329,517489007515,1643572944909,5220076149055,16579242853235

%N The sequence a[n]+b[n]+c[n]+d[n] defined in A126940.

%C Linear recurrence and empirical g.f confirmed for more terms. - _Ray Chandler_, Mar 07 2024

%H Ray Chandler, <a href="/A126945/b126945.txt">Table of n, a(n) for n = 0..1992</a>

%H <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (2, 1, 7, 4, 4, 1).

%F Empirical g.f.: -(x^5 +3*x^4 +5*x^3 +4*x^2 +3*x +1) / (x^6 +4*x^5 +4*x^4 +7*x^3 +x^2 +2*x-1). - _Colin Barker_, Apr 08 2013

%K nonn

%O 0,2

%A _N. J. A. Sloane_, Mar 18 2007