%I A033303
%S A033303 1,3,7,16,36,81,182,409,919,2065,4640,10426,23427,52640,
%T A033303 118281,265775,597191,1341876,3015168,6775021,15223334,
%U A033303 34206521,76861355,172705897,388066628,871977798,1959316327
%N A033303 Expansion of (1+x)/(1-2*x-x^2+x^3).
%C A033303 First differences are in A052534.
%D A033303 R. P. Stanley, Enumerative Combinatorics I, p. 244.
%Y A033303 Sequence in context: A019489 A077852 A020746 this_sequence A078056 A124671 
               A123392
%Y A033303 Adjacent sequences: A033300 A033301 A033302 this_sequence A033304 A033305 
               A033306
%K A033303 nonn,nice,easy
%O A033303 0,2
%A A033303 N. J. A. Sloane (njas(AT)research.att.com).