%I A046183
%S A046183 1,21,11781,203841,113123361,1957283461,1086210502741,18793835590881,
%T A046183 10429793134197921,180458407386358101,100146872588357936901,
%U A046183 1732761608929974897121,961610260163619775927681
%N A046183 Octagonal triangular numbers.
%H A046183 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               OctagonalTriangularNumber.html">Link to a section of The World of 
               Mathematics.</a>
%F A046183 :a(n+2)=9602*a(n+1)-a(n)+2200, a(n+1)=4801*a(n)+1100+980*(24*a(n)^2+11*a(n)+1)^0.5. 
               G.f.: f(z)=a(1)*z+a(2)*z^2+...= (z+21*z^2+2178*z^3+2178*z^4+21*z^5+z^6)/
               ((1-z^2)*(1-9602*z^2+z^4)) (the numerator is divible by 1+z but it 
               is more symetri" like that) - Richard Choulet (richardchoulet(AT)yahoo.fr), 
               Oct 03 2007
%Y A046183 Cf. A046181, A046182.
%Y A046183 Cf. A046182 A046183.
%Y A046183 Sequence in context: A013726 A159358 A048914 this_sequence A167063 A115485 
               A001167
%Y A046183 Adjacent sequences: A046180 A046181 A046182 this_sequence A046184 A046185 
               A046186
%K A046183 nonn
%O A046183 1,2
%A A046183 Eric Weisstein (eric(AT)weisstein.com)
%E A046183 More terms from Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 03 
               2007