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%I #3 Mar 30 2012 18:59:14
%S 1,-4,1,0,-5,1,0,4,-6,1,0,0,9,-7,1,0,0,-4,15,-8,1,0,0,0,-13,22,-9,1,0,
%T 0,0,4,-28,30,-10,1,0,0,0,0,17,-50,39,-11,1,0,0,0,0,-4,45,-80,49,-12,
%U 1,0,0,0,0,0,-21,95,-119,60,-13,1
%N Riordan array (1-4x,x(1-x)).
%C Row sums are A117378. Diagonal sums are A117379. Inverse is A117380.
%F Number triangle T(n,k)=(-1)^(n-k)(C(k,n-k)+4*C(k, n-k-1))
%e Triangle begins
%e 1,
%e -4, 1,
%e 0, -5, 1,
%e 0, 4, -6, 1,
%e 0, 0, 9, -7, 1,
%e 0, 0, -4, 15, -8, 1,
%e 0, 0, 0, -13, 22, -9, 1,
%e 0, 0, 0, 4, -28, 30, -10, 1
%K easy,sign,tabl
%O 0,2
%A _Paul Barry_, Mar 10 2006
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