|
%I #3 Mar 30 2012 18:59:08
%S 1,1,1,1,13,1,1,41,41,1,1,85,321,85,1,1,145,1289,1289,145,1,1,221,
%T 3649,8989,3649,221,1,1,313,8361,40081,40081,8361,313,1,1,421,16641,
%U 134245,265729,134245,16641,421,1,1,545,29961,369305,1256465,1256465,369305
%N A symmetric number triangle based on 2^n.
%C Row sums are A108475. Diagonal sums are A108478.
%F Number triangle T(n, k)=if(k<=n, sum{j=0..n, C(2(n-k), j)C(2k, j)2^j}, 0)
%e Rows begin
%e 1;
%e 1,1;
%e 1,13,1;
%e 1,41,41,1;
%e 1,85,321,85,1;
%e 1,145,1289,1289,145,1;
%K easy,nonn,tabl
%O 0,5
%A _Paul Barry_, Jun 04 2005
|
