%I #6 Oct 21 2019 06:58:00

%S 1,2,5,12,29,68,163,376,895,2046,4845,11018,25997,58930,138699,313756,

%T 737185,1665342,3908059,8820378,20681069,46646884,109305969,246433804,

%U 577207671,1300924056,3046122447,6863883442,16068177699

%N T(n,0) + T(n,1) + ... + T(n,n), T given by A026714.

%p A026721 := proc(n)

%p add( A026714(n,k),k=0..n) ;

%p end proc:

%p seq(A026721(n),n=0..30) ; # _R. J. Mathar_, Oct 21 2019

%K nonn

%O 0,2

%A _Clark Kimberling_