%I A046181
%S A046181 1,3,63,261,6141,25543,601723,2502921,58962681,245260683,5777740983,
%T A046181 24033043981,566159653621,2354993049423,55477868313843,230765285799441,
%U A046181 5436264935102961,22612643015295763
%N A046181 Indices of octagonal numbers which are also triangular.
%H A046181 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 A046181 For n odd, a(n+2)=98*a(n+1)-a(n)-32; for n even, a(n+1)=49*a(n)-16+10*(24*a(n)^2-16*a(n)+1)^0.5 
               - Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 03 2007, Oct 
               09 2007
%Y A046181 Cf. A046182, A046183.
%Y A046181 Cf. A046182 A046183.
%Y A046181 Sequence in context: A087886 A123754 A048354 this_sequence A151993 A120053 
               A139293
%Y A046181 Adjacent sequences: A046178 A046179 A046180 this_sequence A046182 A046183 
               A046184
%K A046181 nonn
%O A046181 1,2
%A A046181 Eric Weisstein (eric(AT)weisstein.com)
%E A046181 More terms from Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 03 
               2007