%I A128415
%S A128415 1,3,1,9,31,57,47,87,449,999,1201,393,5983,16377,25199,10089,70529,
%T A128415 251943,473713,413367,654751,3617721,8234159,10231593,2241857,47651943,
%U A128415 133988401,211357431,98118689
%V A128415 1,-3,1,9,-31,57,-47,-87,449,-999,1201,393,-5983,16377,-25199,10089,70529,
               -251943,
%W A128415 473713,-413367,-654751,3617721,-8234159,10231593,2241857,-47651943,133988401,
%X A128415 -211357431,98118689
%N A128415 Expansion of (1-4x^2)/(1+3x+4x^2).
%C A128415 Row sums of number triangle A128414.
%Y A128415 Sequence in context: A157403 A105951 A038202 this_sequence A090479 A141903 
               A010289
%Y A128415 Adjacent sequences: A128412 A128413 A128414 this_sequence A128416 A128417 
               A128418
%K A128415 easy,sign
%O A128415 0,2
%A A128415 Paul Barry (pbarry(AT)wit.ie), Mar 02 2007