A027017 - OEIS

%I #8 Feb 19 2016 10:53:32

%S 1,7,73,373,1404,4506,13226,36889,99947,266455,704150,1852212,4860468,

%T 12739243,33369709,87385081,228803856,599048334,1568366942,4106082685,

%U 10749916175,28143706267,73681248938,192900093288,505019090664,1322157246031,3461452722961

%N a(n) = T(2*n+1, n+2), T given by A027011.

%H Colin Barker, <a href="/A027017/b027017.txt">Table of n, a(n) for n = 1..1000</a>

%H <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (7,-19,26,-19,7,-1).

%F G.f.: x*(1+43*x^2-31*x^3+17*x^4-7*x^5+x^6) / ((1-x)^4*(1-3*x+x^2)). - _Colin Barker_, Feb 19 2016

%o (PARI) Vec(x*(1+43*x^2-31*x^3+17*x^4-7*x^5+x^6)/((1-x)^4*(1-3*x+x^2)) + O(x^40)) \\ _Colin Barker_, Feb 19 2016

%K nonn,easy

%O 1,2

%A _Clark Kimberling_