%I A117354
%S A117354 1,2,1,2,1,1,6,1,0,1,22,3,1,1,1,90,11,4,4,2,1,394,45,17,16,8,3,1,1806,
%T A117354 197,76,69,34,13,4,1,8558,903,353,313,153,59,19,5,1,41586,4279,1688,
%U A117354 1472,716,278,92,26,6,1,206098,20793,8257,7112,3448,1346,454,134,34
%V A117354 1,-2,1,-2,-1,1,-6,-1,0,1,-22,-3,1,1,1,-90,-11,4,4,2,1,-394,-45,17,16,
               8,3,1,-1806,-197,
%W A117354 76,69,34,13,4,1,-8558,-903,353,313,153,59,19,5,1,-41586,-4279,1688,1472,
               716,278,92,26,
%X A117354 6,1,-206098,-20793,8257,7112,3448,1346,454,134,34
%N A117354 Riordan array (1-x+sqrt(1-6x+x^2))/2, (1+x-sqrt(1-6x+x^2))/4).
%C A117354 First column is A085403. Row sums are A086456. Inverse of A117352.
%e A117354 Triangle begins
%e A117354 1,
%e A117354 -2, 1,
%e A117354 -2, -1, 1,
%e A117354 -6, -1, 0, 1,
%e A117354 -22, -3, 1, 1, 1,
%e A117354 -90, -11, 4, 4, 2, 1,
%e A117354 -394, -45, 17, 16, 8, 3, 1
%Y A117354 Sequence in context: A003417 A158986 A079900 this_sequence A140324 A010250 
               A060024
%Y A117354 Adjacent sequences: A117351 A117352 A117353 this_sequence A117355 A117356 
               A117357
%K A117354 easy,sign,tabl
%O A117354 0,2
%A A117354 Paul Barry (pbarry(AT)wit.ie), Mar 09 2006