A122917 - OEIS

%I #5 Oct 30 2022 21:19:42

%S 1,-1,1,0,-3,1,1,5,-5,1,-1,-6,14,-7,1,0,6,-29,27,-9,1,1,-6,50,-76,44,

%T -11,1,-1,7,-77,175,-155,65,-13,1,0,-9,111,-351,441,-274,90,-15,1,1,

%U 11,-154,638,-1078,924,-441

%N Riordan array (1/(1+x+x^2),x/(1+x)^2).

%C Row sums are A122918. Inverse is A122919.

%e Triangle begins

%e 1,

%e -1, 1,

%e 0, -3, 1,

%e 1, 5, -5, 1,

%e -1, -6, 14, -7, 1,

%e 0, 6, -29, 27, -9, 1,

%e 1, -6, 50, -76, 44, -11, 1,

%e -1, 7, -77, 175, -155, 65, -13, 1

%Y Cf. A122918, A122919.

%K easy,sign,tabl

%O 0,5

%A _Paul Barry_, Sep 19 2006