%I A034430
%S A034430 1,2,7,36,249,2190,23535,299880,4426065,74294010,1397669175,
%T A034430 29123671500,665718201225,16560190196550,445300709428575,
%U A034430 12869793995058000,397815487883438625
%N A034430 Expand arctan(sqrt(x)*sqrt(x+2))/(sqrt(x)*sqrt(x+2)) and multiply n-th 
               term by 1.3.5...(2n+1).
%C A034430 Convolution of A001147 (double factorial numbers) with itself. - DELEHAM 
               Philippe (kolotoko(AT)wanadoo.fr), Mar 21 2005
%F A034430 E.g.f.: 1/(1-x)/sqrt(1-2*x). - Vladeta Jovovic (vladeta(AT)eunet.rs), 
               May 11 2003
%e A034430 1-2*x/3+7*x^2/15-12*x^3/35+83*x^4/315...
%Y A034430 Sequence in context: A167199 A007889 A125033 this_sequence A143805 A112293 
               A090352
%Y A034430 Adjacent sequences: A034427 A034428 A034429 this_sequence A034431 A034432 
               A034433
%K A034430 nonn
%O A034430 0,2
%A A034430 Jim FitzSimons (cherry(AT)neta.com)