A051515 - OEIS

%I #6 Feb 03 2021 14:24:00

%S 9,25,196,324,1089,1521,3600,4624,9025,11025,19044,22500,35721,41209,

%T 61504,69696,99225,110889,152100,168100,223729,245025,318096,345744,

%U 439569,474721,592900,636804,783225,837225,1016064,1081600,1297321

%N (Terms in A014738)/4.

%H <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (1,4,-4,-6,6,4,-4,-1,1).

%F From _Chai Wah Wu_, Feb 03 2021: (Start)

%F a(n) = a(n-1) + 4*a(n-2) - 4*a(n-3) - 6*a(n-4) + 6*a(n-5) + 4*a(n-6) - 4*a(n-7) - a(n-8) + a(n-9) for n > 9.

%F G.f.: x*(-9*x^6 - 16*x^5 - 135*x^4 - 64*x^3 - 135*x^2 - 16*x - 9)/((x - 1)^5*(x + 1)^4). (End)

%Y A014738.

%K nonn

%O 1,1

%A _James A. Sellers_