%I #4 Mar 31 2012 13:20:13
%S 1,2,4,9,20,50,125,324,840,2195,5736,15012,39289,102854,269260,704925,
%T 1845500,4831574,12649205,33116040,86698896,226980647,594243024,
%U 1555748424,4073002225,10663258250,27916772500,73087059249,191344405220
%N Row sums of unsigned triangle |A128495|=|S(2;n,m)| (sums of squares of Chebyshev's S-polynomials).
%F a(n)=sum(|A128495(n,m)|,m=0..n).
%Y Cf. A004523 (looks like signed row sums).
%K nonn,easy
%O 0,2
%A _Wolfdieter Lang_ Apr 04 2007