%I A117377
%S A117377 1,4,1,0,5,1,0,4,6,1,0,0,9,7,1,0,0,4,15,8,1,0,0,0,13,22,9,1,0,0,0,4,28,
%T A117377 30,10,1,0,0,0,0,17,50,39,11,1,0,0,0,0,4,45,80,49,12,1,0,0,0,0,0,21,95,
%U A117377 119,60,13,1
%V A117377 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,
               0,0,4,-28,30,-10,
%W A117377 1,0,0,0,0,17,-50,39,-11,1,0,0,0,0,-4,45,-80,49,-12,1,0,0,0,0,0,-21,95,
               -119,60,-13,1
%N A117377 Riordan array (1-4x,x(1-x)).
%C A117377 Row sums are A117378. Diagonal sums are A117379. Inverse is A117380.
%F A117377 Number triangle T(n,k)=(-1)^(n-k)(C(k,n-k)+4*C(k, n-k-1))
%e A117377 Triangle begins
%e A117377 1,
%e A117377 -4, 1,
%e A117377 0, -5, 1,
%e A117377 0, 4, -6, 1,
%e A117377 0, 0, 9, -7, 1,
%e A117377 0, 0, -4, 15, -8, 1,
%e A117377 0, 0, 0, -13, 22, -9, 1,
%e A117377 0, 0, 0, 4, -28, 30, -10, 1
%Y A117377 Sequence in context: A110146 A126217 A108944 this_sequence A046784 A011349 
               A060196
%Y A117377 Adjacent sequences: A117374 A117375 A117376 this_sequence A117378 A117379 
               A117380
%K A117377 easy,sign,tabl
%O A117377 0,2
%A A117377 Paul Barry (pbarry(AT)wit.ie), Mar 10 2006