%I #4 Mar 31 2012 13:20:04
%S 1,2,4,10,32,132,692,4620,39352,427572,5918992,104375880,2344751912,
%T 67092113592,2444702271152,113425536387240,6700361921561152,
%U 503909247633965712,48243317287320644752,5879293173259041034800
%N Row sums of unsigned triangle A056588.
%F a(n)= sum(((-1)^(floor((m+1)/2)))*A056588(n, m), m=0..n), n >= 0.
%Y Cf. A000045, A056588, A056592.
%K nonn,easy
%O 0,2
%A _Wolfdieter Lang_ Jul 10 2000
|