%I #13 Dec 22 2017 06:11:39
%S 1,4,20,96,444,2000,8840,38528,166124,710256,3016056,12736064,
%T 53530840,224107936,935062544,3890018816,16141765964,66829954736,
%U 276135664664,1138932645056,4690042582664,19285299964256,79196366286704,324835930747136,1330905207444344
%N Row sums of A296666.
%F a(n) = 4^n*((2*(n + 1)*Gamma(n + 1/2))/(sqrt(Pi)*Gamma(n + 1)) - 1).
%F a(n) ~ 4^n*((2*n + 7/4)/sqrt(n*Pi) - 1).
%p a := n -> 4^n*((2*(n + 1)*GAMMA(n + 1/2))/(sqrt(Pi)*GAMMA(n + 1)) - 1);
%p seq(a(n), n=0..24);
%Y Cf. A296666, bisection of A296663.
%K nonn
%O 0,2
%A _Peter Luschny_, Dec 19 2017