%I A156798
%S A156798 4,10,40,130,340,754,1480,2650,4420,6970,10504,15250,21460,29410,39400,
%T A156798 51754,66820,84970,106600,132130,162004,196690,236680,282490,334660,
%U A156798 393754,460360,535090,618580,711490,814504,928330,1053700,1191370
%N A156798 n^4 + 5*n^2 + 4.
%C A156798 a(n) = A002522(n)*A087475(n) = A000290(n)+A000290(A059100(n)) = A028552(A002522(n)).
%F A156798 (n^2 + 1)*(n^2 + 4) = n^2 + (n^2 + 2)^2.
%F A156798 G.f.: 2*(2-5*x+15*x^2-5*x^3+5*x^4)/(1-x)^5 [From Maksym Voznyy (voznyy(AT)mail.ru), 
               Jul 26 2009]
%Y A156798 Sequence in context: A149205 A149206 A149207 this_sequence A149208 A149209 
               A053792
%Y A156798 Adjacent sequences: A156795 A156796 A156797 this_sequence A156799 A156800 
               A156801
%K A156798 nonn
%O A156798 0,1
%A A156798 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 16 2009
%E A156798 G.f. proposed by Maksym Voznyy checked and corrected by R. J. Mathar, 
               Sep 16 2009.