%I A120353
%S A120353 121,1089,9801,88209,793881,7144929,64304361,578739249,5208653241,
%T A120353 46877879169,421900912521,3797108212689,34173973914201,307565765227809,
%U A120353 2768091887050280,24912826983452500,224215442851073000
%N A120353 Sum of 5 consecutive powers of 3, starting with a power of 9..
%C A120353 Always a square.
%H A120353 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/
               RecursiveSequences.html">Recursive Sequences</a>
%F A120353 a(n) = 121*3^(2n-2)
%e A120353 a(2) = 3^2+3^3+3^4+3^5+3^6 = 121*(3^2) = 1089
%Y A120353 Sequence in context: A048950 A020229 A141350 this_sequence A036928 A088171 
               A036308
%Y A120353 Adjacent sequences: A120350 A120351 A120352 this_sequence A120354 A120355 
               A120356
%K A120353 nonn
%O A120353 1,1
%A A120353 Anton Joha (antonjoha(AT)hotmail.com), Jun 25 2006