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A181652 Inverse of number triangle A181651. 1

%I #2 Mar 30 2012 18:59:28

%S 1,-1,1,-1,-1,1,-1,0,-1,1,-1,0,-1,-1,1,-1,0,-1,0,-1,1,-1,0,-1,0,-1,-1,

%T 1,-1,0,-1,0,-1,0,-1,1,-1,0,-1,0,-1,0,-1,-1,1,-1,0,-1,0,-1,0,-1,0,-1,

%U 1,-1,0,-1,0,-1,0,-1,0,-1,-1,1

%N Inverse of number triangle A181651.

%C Generalized (conditional) Riordan array with k-th column generated by x^k*if(mod(k,2)=0,(1-2x)/(1-x),1-x).

%e Triangle begins

%e 1,

%e -1, 1,

%e -1, -1, 1,

%e -1, 0, -1, 1,

%e -1, 0, -1, -1, 1,

%e -1, 0, -1, 0, -1, 1,

%e -1, 0, -1, 0, -1, -1, 1,

%e -1, 0, -1, 0, -1, 0, -1, 1,

%e -1, 0, -1, 0, -1, 0, -1, -1, 1,

%e -1, 0, -1, 0, -1, 0, -1, 0, -1, 1,

%e -1, 0, -1, 0, -1, 0, -1, 0, -1, -1, 1

%e Production matrix begins

%e -1, 1,

%e 0, -2, 1,

%e 1, 0, -2, 1,

%e 1, -1, 0, -2, 1,

%e 2, -1, 1, 0, -2, 1,

%e 2, -1, 1, -1, 0, -2, 1,

%e 3, -1, 2, -1, 1, 0, -2, 1,

%e 3, -1, 2, -1, 1, -1, 0, -2, 1,

%e 4, -1, 3, -1, 2, -1, 1, 0, -2, 1

%Y Cf. A070909.

%K easy,sign,tabl

%O 0,1

%A _Paul Barry_, Nov 03 2010

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Last modified April 19 11:31 EDT 2024. Contains 371792 sequences. (Running on oeis4.)