cp's OEIS Frontend

A154926 Signed version of Pascal's triangle. Diagonal positive, rest negative.

%I A154926 #12 Feb 12 2014 03:17:05
%S A154926 1,-1,1,-1,-2,1,-1,-3,-3,1,-1,-4,-6,-4,1,-1,-5,-10,-10,-5,1,-1,-6,-15,
%T A154926 -20,-15,-6,1,-1,-7,-21,-35,-35,-21,-7,1,-1,-8,-28,-56,-70,-56,-28,-8,
%U A154926 1
%N A154926 Signed version of Pascal's triangle. Diagonal positive, rest negative.
%C A154926 Matrix inverse of this lower triangular array is A154921. Signs in columns as in sequence A153881.
%C A154926 Exponential Riordan array [2-exp(x),x]. - _Paul Barry_, Apr 06 2011
%e A154926 From _Mats Granvik_, Jul 24 2009: (Start)
%e A154926 Table begins:
%e A154926 .1
%e A154926 -1....1
%e A154926 -1...-2....1
%e A154926 -1...-3...-3....1
%e A154926 -1...-4...-6...-4....1
%e A154926 -1...-5..-10..-10...-5....1
%e A154926 -1...-6..-15..-20..-15...-6....1
%e A154926 -1...-7..-21..-35..-35..-21...-7....1
%e A154926 -1...-8..-28..-56..-70..-56..-28...-8....1
%e A154926 -1...-9..-36..-84.-126.-126..-84..-36...-9....1
%e A154926 -1..-10..-45.-120.-210.-252.-210.-120..-45..-10....1
%e A154926 -1..-11..-55.-165.-330.-462.-462.-330.-165..-55..-11....1
%e A154926 (End)
%Y A154926 Cf. A007318, A153881.
%K A154926 sign,tabl
%O A154926 1,5
%A A154926 _Mats Granvik_, Jan 17 2009