%I A081181
%S A081181 1,3,6,20,35,126,210,792,1287,5005,8008,31824,50388,203490,319770,
%T A081181 1307504,2042975,8436285,13123110,54627300,84672315,354817320,548354040,
%U A081181 2310789600,3562467300,15084504396,23206929840,98672427616,151532656696
%N A081181 Staircase on Pascal's triangle.
%C A081181 Arrange Pascal's triangle as a square array. A081181 is then a diagonal 
               staircase on the square array. A companion staircase is given by 
               A065942.
%F A081181 a(n) = binomial(floor((n + 1)/2) + (n + 1), n).
%Y A081181 Sequence in context: A052393 A024607 A058818 this_sequence A062164 A052408 
               A148573
%Y A081181 Adjacent sequences: A081178 A081179 A081180 this_sequence A081182 A081183 
               A081184
%K A081181 easy,nonn
%O A081181 0,2
%A A081181 Paul Barry (pbarry(AT)wit.ie), Mar 11 2003